3x=40-1x

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Solution for 3x=40-1x equation: 



3x=40-1x

We move all terms to the left:

3x-(40-1x)=0

We add all the numbers together, and all the variables

3x-(-1x+40)=0

We get rid of parentheses

3x+1x-40=0

We add all the numbers together, and all the variables

4x-40=0

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

4x=40

x=40/4

x=10

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