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Anonymous
3x=18
x=18/3
x=6
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If x-3x=18 then x equals -9
3x-4x=12 that means -x equals 12 so x equals -12
18 = 3x6 = x
If x equals 8, then 3x equals 24. 24-x would equal 16.
you mean: x+3x+3=x+18 so x=5