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70+0.20x=50+0.40x
We move all terms to the left:
70+0.20x-(50+0.40x)=0
We add all the numbers together, and all the variables
0.20x-(0.40x+50)+70=0
We get rid of parentheses
0.20x-0.40x-50+70=0
We add all the numbers together, and all the variables
-0.2x+20=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-20
x=-20/-0.2
x=+100
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