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-0.5x=-40+0.3x
We move all terms to the left:
-0.5x-(-40+0.3x)=0
We add all the numbers together, and all the variables
-0.5x-(0.3x-40)=0
We get rid of parentheses
-0.5x-0.3x+40=0
We add all the numbers together, and all the variables
-0.8x+40=0
We move all terms containing x to the left, all other terms to the right
-0.8x=-40
x=-40/-0.8
x=+50
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