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-7(7x+10)=-315
We move all terms to the left:
-7(7x+10)-(-315)=0
We add all the numbers together, and all the variables
-7(7x+10)+315=0
We multiply parentheses
-49x-70+315=0
We add all the numbers together, and all the variables
-49x+245=0
We move all terms containing x to the left, all other terms to the right
-49x=-245
x=-245/-49
x=+5
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