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13.5=20-3x
We move all terms to the left:
13.5-(20-3x)=0
We add all the numbers together, and all the variables
-(-3x+20)+13.5=0
We get rid of parentheses
3x-20+13.5=0
We add all the numbers together, and all the variables
3x-6.5=0
We move all terms containing x to the left, all other terms to the right
3x=6.5
x=6.5/3
x=2+0.5/3
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