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-7(-6x-3)=315
We move all terms to the left:
-7(-6x-3)-(315)=0
We multiply parentheses
42x+21-315=0
We add all the numbers together, and all the variables
42x-294=0
We move all terms containing x to the left, all other terms to the right
42x=294
x=294/42
x=7
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