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-x-89=-9x+55
We move all terms to the left:
-x-89-(-9x+55)=0
We add all the numbers together, and all the variables
-1x-(-9x+55)-89=0
We get rid of parentheses
-1x+9x-55-89=0
We add all the numbers together, and all the variables
8x-144=0
We move all terms containing x to the left, all other terms to the right
8x=144
x=144/8
x=18
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