30=-10(7-5b)

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Solution for 30=-10(7-5b) equation: 



30=-10(7-5b)

We move all terms to the left:

30-(-10(7-5b))=0

We add all the numbers together, and all the variables

-(-10(-5b+7))+30=0



We calculate terms in parentheses: -(-10(-5b+7)), so:

-10(-5b+7)

We multiply parentheses

50b-70

Back to the equation:

-(50b-70)



We get rid of parentheses

-50b+70+30=0

We add all the numbers together, and all the variables

-50b+100=0

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

-50b=-100

b=-100/-50

b=+2

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