(x+20)+3x=180+120

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Solution for (x+20)+3x=180+120 equation: 



(x+20)+3x=180+120

We move all terms to the left:

(x+20)+3x-(180+120)=0

We add all the numbers together, and all the variables

(x+20)+3x-300=0

We add all the numbers together, and all the variables

3x+(x+20)-300=0

We get rid of parentheses

3x+x+20-300=0

We add all the numbers together, and all the variables

4x-280=0

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

4x=280

x=280/4

x=70

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