0.5*x+3*x=20

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Solution for 0.5*x+3*x=20 equation: 



0.5x+3x=20

We move all terms to the left:

0.5x+3x-(20)=0

We add all the numbers together, and all the variables

3.5x-20=0

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

3.5x=20

x=20/3.5

x=5+2.5/3.5

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