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Anonymous
If: -3x = 15
Then: x = -5
Because: -3 times -5 = 15
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15=30-3x 15-30=3x -15=3x -15/3=x -5=x
-3x=-15+6 -3x=-9 x=-9/-3 x=3
(3x - 9 =15) +9 = 3x=(24)/3 = x=8 x=8
x=5
3x+12x = 15 15x = 15 x = 1