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140+0.30x=80+0.40x
We move all terms to the left:
140+0.30x-(80+0.40x)=0
We add all the numbers together, and all the variables
0.30x-(0.40x+80)+140=0
We get rid of parentheses
0.30x-0.40x-80+140=0
We add all the numbers together, and all the variables
-0.1x+60=0
We move all terms containing x to the left, all other terms to the right
-0.1x=-60
x=-60/-0.1
x=+600
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