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7+x=5x+51
We move all terms to the left:
7+x-(5x+51)=0
We get rid of parentheses
x-5x-51+7=0
We add all the numbers together, and all the variables
-4x-44=0
We move all terms containing x to the left, all other terms to the right
-4x=44
x=44/-4
x=-11
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