-2(10+20b)=-3(12b+4)

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Solution for -2(10+20b)=-3(12b+4) equation: 



-2(10+20b)=-3(12b+4)

We move all terms to the left:

-2(10+20b)-(-3(12b+4))=0

We add all the numbers together, and all the variables

-2(20b+10)-(-3(12b+4))=0

We multiply parentheses

-40b-(-3(12b+4))-20=0



We calculate terms in parentheses: -(-3(12b+4)), so:

-3(12b+4)

We multiply parentheses

-36b-12

Back to the equation:

-(-36b-12)



We get rid of parentheses

-40b+36b+12-20=0

We add all the numbers together, and all the variables

-4b-8=0

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

-4b=8

b=8/-4

b=-2

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