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-12x-30=40-10x
We move all terms to the left:
-12x-30-(40-10x)=0
We add all the numbers together, and all the variables
-12x-(-10x+40)-30=0
We get rid of parentheses
-12x+10x-40-30=0
We add all the numbers together, and all the variables
-2x-70=0
We move all terms containing x to the left, all other terms to the right
-2x=70
x=70/-2
x=-35
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