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7x+12-x=-9x
We move all terms to the left:
7x+12-x-(-9x)=0
We add all the numbers together, and all the variables
6x-(-9x)+12=0
We get rid of parentheses
6x+9x+12=0
We add all the numbers together, and all the variables
15x+12=0
We move all terms containing x to the left, all other terms to the right
15x=-12
x=-12/15
x=-4/5
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