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79=0.8x+80
We move all terms to the left:
79-(0.8x+80)=0
We get rid of parentheses
-0.8x-80+79=0
We add all the numbers together, and all the variables
-0.8x-1=0
We move all terms containing x to the left, all other terms to the right
-0.8x=1
x=1/-0.8
x=-1+0.2/0.8
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