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6x+1+(3x+8)=90
We move all terms to the left:
6x+1+(3x+8)-(90)=0
We add all the numbers together, and all the variables
6x+(3x+8)-89=0
We get rid of parentheses
6x+3x+8-89=0
We add all the numbers together, and all the variables
9x-81=0
We move all terms containing x to the left, all other terms to the right
9x=81
x=81/9
x=9
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