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-15(-17+x)=645
We move all terms to the left:
-15(-17+x)-(645)=0
We add all the numbers together, and all the variables
-15(x-17)-645=0
We multiply parentheses
-15x+255-645=0
We add all the numbers together, and all the variables
-15x-390=0
We move all terms containing x to the left, all other terms to the right
-15x=390
x=390/-15
x=-26
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