B(x)=-3x-15

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Solution for B(x)=-3x-15 equation: 



(B)=-3B-15

We move all terms to the left:

(B)-(-3B-15)=0

We get rid of parentheses

B+3B+15=0

We add all the numbers together, and all the variables

4B+15=0

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

4B=-15

B=-15/4

B=-3+3/4

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