30-3x=40-7x

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Solution for 30-3x=40-7x equation: 



30-3x=40-7x

We move all terms to the left:

30-3x-(40-7x)=0

We add all the numbers together, and all the variables

-3x-(-7x+40)+30=0

We get rid of parentheses

-3x+7x-40+30=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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