20+3x=120

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Solution for 20+3x=120 equation: 



20+3x=120

We move all terms to the left:

20+3x-(120)=0

We add all the numbers together, and all the variables

3x-100=0

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

3x=100

x=100/3

x=33+1/3

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