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-4+5x=-7x-124
We move all terms to the left:
-4+5x-(-7x-124)=0
We get rid of parentheses
5x+7x+124-4=0
We add all the numbers together, and all the variables
12x+120=0
We move all terms containing x to the left, all other terms to the right
12x=-120
x=-120/12
x=-10
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