Solving equations (unknowns both sides)
To solve an equation with unknowns on both sides, we must first get the letter representing the unknown amount on one side of the equation only. We do this by adding or subtracting amounts of the unknown to both sides of the equation.
For example, in the equation 4x + 3 = 2x + 9, we need to subtract 2x from both sides of the equation. This will leave just 9 on the righthand side, and 2x + 3 on the left. The equation then becomes 2x + 3 = 9, which we can solve like a normal twostep equation. It is best to avoid dealing with negative numbers where possible  to do this, always remove the smaller number of unknowns by adding or subtracting. 
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