How to solve:
Solve for x:
6x - 24 = -3x + 21.
Add 3x to both sides:
6x -24 + 3x = -3x + 21 + 3x.
Simplify:
9x - 24 = 21.
Add 24 to both sides:
9x - 24 + 24 = 21 + 24.
Simplify:
9x = 45.
Divide both sides by 9:
9x/9 = 45/9.
Simplify:
x = 5.
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