3x-40=140-7x

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Solution for 3x-40=140-7x equation: 



3x-40=140-7x

We move all terms to the left:

3x-40-(140-7x)=0

We add all the numbers together, and all the variables

3x-(-7x+140)-40=0

We get rid of parentheses

3x+7x-140-40=0

We add all the numbers together, and all the variables

10x-180=0

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

10x=180

x=180/10

x=18

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