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7(x+2)=77.x+2=
We move all terms to the left:
7(x+2)-(77.x+2)=0
We multiply parentheses
7x-(77.x+2)+14=0
We get rid of parentheses
7x-77.x-2+14=0
We add all the numbers together, and all the variables
-70x+12=0
We move all terms containing x to the left, all other terms to the right
-70x=-12
x=-12/-70
x=6/35
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