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-166=7x+18x+9
We move all terms to the left:
-166-(7x+18x+9)=0
We add all the numbers together, and all the variables
-(25x+9)-166=0
We get rid of parentheses
-25x-9-166=0
We add all the numbers together, and all the variables
-25x-175=0
We move all terms containing x to the left, all other terms to the right
-25x=175
x=175/-25
x=-7
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