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x=51+2x
We move all terms to the left:
x-(51+2x)=0
We add all the numbers together, and all the variables
x-(2x+51)=0
We get rid of parentheses
x-2x-51=0
We add all the numbers together, and all the variables
-1x-51=0
We move all terms containing x to the left, all other terms to the right
-x=51
x=51/-1
x=-51
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