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(3x - 9 =15) +9 = 3x=(24)/3 = x=8 x=8
-3x=-15+6 -3x=-9 x=-9/-3 x=3
If x-3x=18 then x equals -9
15=30-3x 15-30=3x -15=3x -15/3=x -5=x
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