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130+0.70x=80+0.80x
We move all terms to the left:
130+0.70x-(80+0.80x)=0
We add all the numbers together, and all the variables
0.70x-(0.80x+80)+130=0
We get rid of parentheses
0.70x-0.80x-80+130=0
We add all the numbers together, and all the variables
-0.1x+50=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-50
x=-50/-0.1
x=+500
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