- 15 = 3X - 12
add 12 to each side
12 + - 15 = 3X - 12 + 12
- 3 = 3X
divide both sides integers by 3
- 3/3 = (3/3)X
- 1 = X
======check in original equation
- 15 = 3(- 1) - 12
- 15 = - 3 - 12
- 15 = - 15
=========checks
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