40=10(-1v+9)

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Solution for 40=10(-1v+9) equation: 



40=10(-1v+9)

We move all terms to the left:

40-(10(-1v+9))=0



We calculate terms in parentheses: -(10(-1v+9)), so:

10(-1v+9)

We multiply parentheses

-10v+90

Back to the equation:

-(-10v+90)



We get rid of parentheses

10v-90+40=0

We add all the numbers together, and all the variables

10v-50=0

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

10v=50

v=50/10

v=5

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