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-77+8x=127-9x
We move all terms to the left:
-77+8x-(127-9x)=0
We add all the numbers together, and all the variables
8x-(-9x+127)-77=0
We get rid of parentheses
8x+9x-127-77=0
We add all the numbers together, and all the variables
17x-204=0
We move all terms containing x to the left, all other terms to the right
17x=204
x=204/17
x=12
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