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7x-85+4x-42=8x+45-12x+128
We move all terms to the left:
7x-85+4x-42-(8x+45-12x+128)=0
We add all the numbers together, and all the variables
7x+4x-(-4x+173)-85-42=0
We add all the numbers together, and all the variables
11x-(-4x+173)-127=0
We get rid of parentheses
11x+4x-173-127=0
We add all the numbers together, and all the variables
15x-300=0
We move all terms containing x to the left, all other terms to the right
15x=300
x=300/15
x=20
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