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x+5(x-9)=90
We move all terms to the left:
x+5(x-9)-(90)=0
We multiply parentheses
x+5x-45-90=0
We add all the numbers together, and all the variables
6x-135=0
We move all terms containing x to the left, all other terms to the right
6x=135
x=135/6
x=22+1/2
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