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6x+(2x+20)=90
We move all terms to the left:
6x+(2x+20)-(90)=0
We get rid of parentheses
6x+2x+20-90=0
We add all the numbers together, and all the variables
8x-70=0
We move all terms containing x to the left, all other terms to the right
8x=70
x=70/8
x=8+3/4
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