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-10x+12=-3x+40
We move all terms to the left:
-10x+12-(-3x+40)=0
We get rid of parentheses
-10x+3x-40+12=0
We add all the numbers together, and all the variables
-7x-28=0
We move all terms containing x to the left, all other terms to the right
-7x=28
x=28/-7
x=-4
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