30+x=40+3x

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Solution for 30+x=40+3x equation: 



30+x=40+3x

We move all terms to the left:

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

We add all the numbers together, and all the variables

x-(3x+40)+30=0

We get rid of parentheses

x-3x-40+30=0

We add all the numbers together, and all the variables

-2x-10=0

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

-2x=10

x=10/-2

x=-5

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