7x=30-3x=40

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



7x=30-3x=40

We move all terms to the left:

7x-(30-3x)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

7x+3x-30=0

We add all the numbers together, and all the variables

10x-30=0

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

10x=30

x=30/10

x=3

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