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80=0.5x+4
We move all terms to the left:
80-(0.5x+4)=0
We get rid of parentheses
-0.5x-4+80=0
We add all the numbers together, and all the variables
-0.5x+76=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-76
x=-76/-0.5
x=+152
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