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51-2x=-12x-51
We move all terms to the left:
51-2x-(-12x-51)=0
We get rid of parentheses
-2x+12x+51+51=0
We add all the numbers together, and all the variables
10x+102=0
We move all terms containing x to the left, all other terms to the right
10x=-102
x=-102/10
x=-10+1/5
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