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0.8x=70+0.3x
We move all terms to the left:
0.8x-(70+0.3x)=0
We add all the numbers together, and all the variables
0.8x-(0.3x+70)=0
We get rid of parentheses
0.8x-0.3x-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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