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51=2x+8+x-5+2x+8+x-5
We move all terms to the left:
51-(2x+8+x-5+2x+8+x-5)=0
We add all the numbers together, and all the variables
-(6x+6)+51=0
We get rid of parentheses
-6x-6+51=0
We add all the numbers together, and all the variables
-6x+45=0
We move all terms containing x to the left, all other terms to the right
-6x=-45
x=-45/-6
x=7+1/2
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