3x-0.5x=20

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Solution for 3x-0.5x=20 equation: 



3x-0.5x=20

We move all terms to the left:

3x-0.5x-(20)=0

We add all the numbers together, and all the variables

2.5x-20=0

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

2.5x=20

x=20/2.5

x=8

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