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9x+18+5(x+7)+15=90
We move all terms to the left:
9x+18+5(x+7)+15-(90)=0
We add all the numbers together, and all the variables
9x+5(x+7)-57=0
We multiply parentheses
9x+5x+35-57=0
We add all the numbers together, and all the variables
14x-22=0
We move all terms containing x to the left, all other terms to the right
14x=22
x=22/14
x=1+4/7
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