30x=40-x

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Solution for 30x=40-x equation: 



30x=40-x

We move all terms to the left:

30x-(40-x)=0

We add all the numbers together, and all the variables

30x-(-1x+40)=0

We get rid of parentheses

30x+1x-40=0

We add all the numbers together, and all the variables

31x-40=0

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

31x=40

x=40/31

x=1+9/31

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