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7(x+11)+5(12-x)=0
We add all the numbers together, and all the variables
7(x+11)+5(-1x+12)=0
We multiply parentheses
7x-5x+77+60=0
We add all the numbers together, and all the variables
2x+137=0
We move all terms containing x to the left, all other terms to the right
2x=-137
x=-137/2
x=-68+1/2
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