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100+0.50x=70+0.80x
We move all terms to the left:
100+0.50x-(70+0.80x)=0
We add all the numbers together, and all the variables
0.50x-(0.80x+70)+100=0
We get rid of parentheses
0.50x-0.80x-70+100=0
We add all the numbers together, and all the variables
-0.3x+30=0
We move all terms containing x to the left, all other terms to the right
-0.3x=-30
x=-30/-0.3
x=+100
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