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40+0.30x=0.80x
We move all terms to the left:
40+0.30x-(0.80x)=0
We add all the numbers together, and all the variables
0.30x-(+0.80x)+40=0
We get rid of parentheses
0.30x-0.80x+40=0
We add all the numbers together, and all the variables
-0.5x+40=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-40
x=-40/-0.5
x=+80
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