40+3n=7(10-n)

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Solution for 40+3n=7(10-n) equation: 



40+3n=7(10-n)

We move all terms to the left:

40+3n-(7(10-n))=0

We add all the numbers together, and all the variables

3n-(7(-1n+10))+40=0



We calculate terms in parentheses: -(7(-1n+10)), so:

7(-1n+10)

We multiply parentheses

-7n+70

Back to the equation:

-(-7n+70)



We get rid of parentheses

3n+7n-70+40=0

We add all the numbers together, and all the variables

10n-30=0

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

10n=30

n=30/10

n=3

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