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48=40+0.20x
We move all terms to the left:
48-(40+0.20x)=0
We add all the numbers together, and all the variables
-(0.20x+40)+48=0
We get rid of parentheses
-0.20x-40+48=0
We add all the numbers together, and all the variables
-0.2x+8=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-8
x=-8/-0.2
x=+40
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