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70+0.20x=30+0.70x
We move all terms to the left:
70+0.20x-(30+0.70x)=0
We add all the numbers together, and all the variables
0.20x-(0.70x+30)+70=0
We get rid of parentheses
0.20x-0.70x-30+70=0
We add all the numbers together, and all the variables
-0.5x+40=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-40
x=-40/-0.5
x=+80
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