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-5(x+9)=90
We move all terms to the left:
-5(x+9)-(90)=0
We multiply parentheses
-5x-45-90=0
We add all the numbers together, and all the variables
-5x-135=0
We move all terms containing x to the left, all other terms to the right
-5x=135
x=135/-5
x=-27
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