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0.80x=70+0.30x
We move all terms to the left:
0.80x-(70+0.30x)=0
We add all the numbers together, and all the variables
0.80x-(0.30x+70)=0
We get rid of parentheses
0.80x-0.30x-70=0
We add all the numbers together, and all the variables
0.5x-70=0
We move all terms containing x to the left, all other terms to the right
0.5x=70
x=70/0.5
x=140
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