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0.30x+130=0.50x+70
We move all terms to the left:
0.30x+130-(0.50x+70)=0
We get rid of parentheses
0.30x-0.50x-70+130=0
We add all the numbers together, and all the variables
-0.2x+60=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-60
x=-60/-0.2
x=+300
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