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x+(6x+10)+(x+2)=90
We move all terms to the left:
x+(6x+10)+(x+2)-(90)=0
We get rid of parentheses
x+6x+x+10+2-90=0
We add all the numbers together, and all the variables
8x-78=0
We move all terms containing x to the left, all other terms to the right
8x=78
x=78/8
x=9+3/4
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