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3(x+21)+4(x+14)=35
We move all terms to the left:
3(x+21)+4(x+14)-(35)=0
We multiply parentheses
3x+4x+63+56-35=0
We add all the numbers together, and all the variables
7x+84=0
We move all terms containing x to the left, all other terms to the right
7x=-84
x=-84/7
x=-12
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