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12(8x+21)=-708
We move all terms to the left:
12(8x+21)-(-708)=0
We add all the numbers together, and all the variables
12(8x+21)+708=0
We multiply parentheses
96x+252+708=0
We add all the numbers together, and all the variables
96x+960=0
We move all terms containing x to the left, all other terms to the right
96x=-960
x=-960/96
x=-10
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