7x-40=30+3x

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



7x-40=30+3x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

7x-3x-30-40=0

We add all the numbers together, and all the variables

4x-70=0

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

4x=70

x=70/4

x=17+1/2

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