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120+0.20x=70+0.40x
We move all terms to the left:
120+0.20x-(70+0.40x)=0
We add all the numbers together, and all the variables
0.20x-(0.40x+70)+120=0
We get rid of parentheses
0.20x-0.40x-70+120=0
We add all the numbers together, and all the variables
-0.2x+50=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-50
x=-50/-0.2
x=+250
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