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6x+7x-51=85-4x
We move all terms to the left:
6x+7x-51-(85-4x)=0
We add all the numbers together, and all the variables
6x+7x-(-4x+85)-51=0
We add all the numbers together, and all the variables
13x-(-4x+85)-51=0
We get rid of parentheses
13x+4x-85-51=0
We add all the numbers together, and all the variables
17x-136=0
We move all terms containing x to the left, all other terms to the right
17x=136
x=136/17
x=8
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