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x+12+4x-7=18-
We move all terms to the left:
x+12+4x-7-(18-)=0
We add all the numbers together, and all the variables
x+4x+12-7-0=0
We add all the numbers together, and all the variables
5x+5=0
We move all terms containing x to the left, all other terms to the right
5x=-5
x=-5/5
x=-1
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