Solving Equations Unknown on Both Sides

## Solving Equations Unknown on Both Sides

Where an unknown appears on both side of an equation, the equation needs to be re-arranged so that all the values of the unknown are on one side of the equation, and the numbers on the other:

Start by identifying on which side of the equation the lowest value of the unknown appears

Remove the lowest unknown value from both sides of the equation

The equation then can be solved as an equation with an unknown on one side

## Example 1

Solve 6x-7=4x-3.

 6x - 7 = 4x - 3 Subtract 4x from both sides 2x - 7 =  - 3 Add 7 to both sides 2x   =   4 Divide both sides by 2 x   =   2

Check 6(2)-7=4(2)-3

Answer: x=5

## Example 2

Solve 7x+5=4x-4.

 7x + 5 = 4x - 4 Subtract 4x from both sides 3x + 5 = - 4 Subtract 5 from both sides 3x = - 9 Divide both sides by 3 x = - 3

Check 7(-3)+5=4(-3)-3

Answer: x=-3