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6x+2(4x+5)=80
We move all terms to the left:
6x+2(4x+5)-(80)=0
We multiply parentheses
6x+8x+10-80=0
We add all the numbers together, and all the variables
14x-70=0
We move all terms containing x to the left, all other terms to the right
14x=70
x=70/14
x=5
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