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Anonymous
X equals -4 because if you pluged in 12 divided by -3 it equals -4.
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3x-4x=12 that means -x equals 12 so x equals -12
19 (7 + 12 = 4x - 3x)
x=2 y=1.5
3x=12 3x/3=12/3 x=4
3x=18 x=18/3 x=6