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12x+14=77+5x
We move all terms to the left:
12x+14-(77+5x)=0
We add all the numbers together, and all the variables
12x-(5x+77)+14=0
We get rid of parentheses
12x-5x-77+14=0
We add all the numbers together, and all the variables
7x-63=0
We move all terms containing x to the left, all other terms to the right
7x=63
x=63/7
x=9
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