3x+10=20-x

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Solution for 3x+10=20-x equation: 



3x+10=20-x

We move all terms to the left:

3x+10-(20-x)=0

We add all the numbers together, and all the variables

3x-(-1x+20)+10=0

We get rid of parentheses

3x+1x-20+10=0

We add all the numbers together, and all the variables

4x-10=0

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

4x=10

x=10/4

x=2+1/2

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