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6x+2(2x+10)=90
We move all terms to the left:
6x+2(2x+10)-(90)=0
We multiply parentheses
6x+4x+20-90=0
We add all the numbers together, and all the variables
10x-70=0
We move all terms containing x to the left, all other terms to the right
10x=70
x=70/10
x=7
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