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x+x(.5)=80
We move all terms to the left:
x+x(.5)-(80)=0
We add all the numbers together, and all the variables
x+x(0.5)-80=0
We multiply parentheses
x+0.5x-80=0
We add all the numbers together, and all the variables
1.5x-80=0
We move all terms containing x to the left, all other terms to the right
1.5x=80
x=80/1.5
x=53+0.5/1.5
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