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0.40x+70=0.60x+50
We move all terms to the left:
0.40x+70-(0.60x+50)=0
We get rid of parentheses
0.40x-0.60x-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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