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80=-0.4x+200
We move all terms to the left:
80-(-0.4x+200)=0
We get rid of parentheses
0.4x-200+80=0
We add all the numbers together, and all the variables
0.4x-120=0
We move all terms containing x to the left, all other terms to the right
0.4x=120
x=120/0.4
x=300
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