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-10+7x=-30+3x
We move all terms to the left:
-10+7x-(-30+3x)=0
We add all the numbers together, and all the variables
7x-(3x-30)-10=0
We get rid of parentheses
7x-3x+30-10=0
We add all the numbers together, and all the variables
4x+20=0
We move all terms containing x to the left, all other terms to the right
4x=-20
x=-20/4
x=-5
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