.15(b+30)+.42(b+15)=-14.85

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Solution for .15(b+30)+.42(b+15)=-14.85 equation: 



.15(b+30)+.42(b+15)=-14.85

We move all terms to the left:

.15(b+30)+.42(b+15)-(-14.85)=0

We add all the numbers together, and all the variables

.15(b+30)+.42(b+15)+14.85=0

We multiply parentheses

0.15b+0.42b+4.5+6.3+14.85=0

We add all the numbers together, and all the variables

0.57b+25.65=0

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

0.57b=-25.65

b=-25.65/0.57

b=-45

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