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10x-81=-x+128
We move all terms to the left:
10x-81-(-x+128)=0
We add all the numbers together, and all the variables
10x-(-1x+128)-81=0
We get rid of parentheses
10x+1x-128-81=0
We add all the numbers together, and all the variables
11x-209=0
We move all terms containing x to the left, all other terms to the right
11x=209
x=209/11
x=19
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