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-7(-3+x)=-42
We move all terms to the left:
-7(-3+x)-(-42)=0
We add all the numbers together, and all the variables
-7(x-3)-(-42)=0
We add all the numbers together, and all the variables
-7(x-3)+42=0
We multiply parentheses
-7x+21+42=0
We add all the numbers together, and all the variables
-7x+63=0
We move all terms containing x to the left, all other terms to the right
-7x=-63
x=-63/-7
x=+9
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