20-3x=15.5

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Solution for 20-3x=15.5 equation: 



20-3x=15.5

We move all terms to the left:

20-3x-(15.5)=0

We add all the numbers together, and all the variables

-3x+4.5=0

We move all terms containing x to the left, all other terms to the right

-3x=-4.5

x=-4.5/-3

x=1+1/2

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