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40+x=3.50x
We move all terms to the left:
40+x-(3.50x)=0
We add all the numbers together, and all the variables
x-(+3.50x)+40=0
We get rid of parentheses
x-3.50x+40=0
We add all the numbers together, and all the variables
-2.5x+40=0
We move all terms containing x to the left, all other terms to the right
-2.5x=-40
x=-40/-2.5
x=+16
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