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18(4+x)=80
We move all terms to the left:
18(4+x)-(80)=0
We add all the numbers together, and all the variables
18(x+4)-80=0
We multiply parentheses
18x+72-80=0
We add all the numbers together, and all the variables
18x-8=0
We move all terms containing x to the left, all other terms to the right
18x=8
x=8/18
x=4/9
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