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4x+51=8x-13
We move all terms to the left:
4x+51-(8x-13)=0
We get rid of parentheses
4x-8x+13+51=0
We add all the numbers together, and all the variables
-4x+64=0
We move all terms containing x to the left, all other terms to the right
-4x=-64
x=-64/-4
x=+16
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