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120+0.20x=50+0.30x
We move all terms to the left:
120+0.20x-(50+0.30x)=0
We add all the numbers together, and all the variables
0.20x-(0.30x+50)+120=0
We get rid of parentheses
0.20x-0.30x-50+120=0
We add all the numbers together, and all the variables
-0.1x+70=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-70
x=-70/-0.1
x=+700
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