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3x+7=5x-15+51-x
We move all terms to the left:
3x+7-(5x-15+51-x)=0
We add all the numbers together, and all the variables
3x-(4x+36)+7=0
We get rid of parentheses
3x-4x-36+7=0
We add all the numbers together, and all the variables
-1x-29=0
We move all terms containing x to the left, all other terms to the right
-x=29
x=29/-1
x=-29
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