7x+20=120-3x

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Solution for 7x+20=120-3x equation: 



7x+20=120-3x

We move all terms to the left:

7x+20-(120-3x)=0

We add all the numbers together, and all the variables

7x-(-3x+120)+20=0

We get rid of parentheses

7x+3x-120+20=0

We add all the numbers together, and all the variables

10x-100=0

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

10x=100

x=100/10

x=10

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