AimMent

For Class 8, 9 & 10

Foundation - a strong base in Physics, Chemistry, Maths & Biology

Concept-first questions with clear model answers across all four subjects, aligned to NCERT. Start early, build the habit, and walk into your board exams, NEET and JEE already ahead.

Class 824Class 924Class 1036
SubjectAllPhysics 19Chemistry 19Biology 19Mathematics 27
ChapterAllAlgebraic Expressions and IdentitiesCell Structure and FunctionsChemical Effects of Electric CurrentCoal and PetroleumCombustion and FlameComparing QuantitiesConservation of Plants and AnimalsCrop Production and ManagementExponents and PowersForce and PressureFrictionLightLinear Equations in One VariableMaterials: Metals and Non-MetalsMensurationMicroorganisms: Friend and FoePollution of Air and WaterReaching the Age of AdolescenceReproduction in AnimalsSome Natural PhenomenaSoundSquares and Square RootsSynthetic Fibres and Plastics

Showing 1 question for Class 8. Tap a card to reveal the answer.

MathematicsLinear Equations in One Variableeasy

Solve the linear equation 3x + 5 = 20.

Reveal answer ↓

What it is

Solving an equation means undoing the operations to leave the unknown by itself.

Answer

Subtract 5 from both sides: 3x = 20 - 5 = 15. Divide both sides by 3: x = 15/3 = 5. So x = 5. Check: 3(5) + 5 = 15 + 5 = 20, which is correct.

Isolate the variable using inverse operations

  • •3x = 20 - 5 = 15
  • •x = 15/3 = 5
  • •Check: 3(5) + 5 = 20

Why learn this

Every 'find the missing value' problem - money, coding, physics - is a hidden equation.

💡 Memory trick

Do the opposite, in reverse order: undo the +5 first, then the x3.