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100+0.70x-0.70x=30+0.80x-0.70x
We move all terms to the left:
100+0.70x-0.70x-(30+0.80x-0.70x)=0
We add all the numbers together, and all the variables
0.70x-0.70x-(0.1x+30)+100=0
We add all the numbers together, and all the variables
-(0.1x+30)+100=0
We get rid of parentheses
-0.1x-30+100=0
We add all the numbers together, and all the variables
-0.1x+70=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-70
x=-70/-0.1
x=+700
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