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7x-12x=-18-2
We move all terms to the left:
7x-12x-(-18-2)=0
We add all the numbers together, and all the variables
7x-12x-(-20)=0
We add all the numbers together, and all the variables
-5x+20=0
We move all terms containing x to the left, all other terms to the right
-5x=-20
x=-20/-5
x=+4
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