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130+.2x=50+.40x
We move all terms to the left:
130+.2x-(50+.40x)=0
We add all the numbers together, and all the variables
.2x-(.40x+50)+130=0
We get rid of parentheses
.2x-.40x-50+130=0
We add all the numbers together, and all the variables
-0.2x+80=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-80
x=-80/-0.2
x=+400
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