(3-b)(-4)=0

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Solution for (3-b)(-4)=0 equation: 



(3-b)(-4)=0

We add all the numbers together, and all the variables

(-1b+3)(-4)=0

We multiply parentheses ..

(+4b-12)=0

We add all the numbers together, and all the variables

(4b-12)=0

We get rid of parentheses

4b-12=0

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

4b=12

b=12/4

b=3

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