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10x-2x+87=10x+51
We move all terms to the left:
10x-2x+87-(10x+51)=0
We add all the numbers together, and all the variables
8x-(10x+51)+87=0
We get rid of parentheses
8x-10x-51+87=0
We add all the numbers together, and all the variables
-2x+36=0
We move all terms containing x to the left, all other terms to the right
-2x=-36
x=-36/-2
x=+18
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