(12+7.2b)-3(.9b-4)=

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Solution for (12+7.2b)-3(.9b-4)= equation: 


Simplifying
(12 + 7.2b) + -3(0.9b + -4) = 0

Remove parenthesis around (12 + 7.2b)
12 + 7.2b + -3(0.9b + -4) = 0

Reorder the terms:
12 + 7.2b + -3(-4 + 0.9b) = 0
12 + 7.2b + (-4 * -3 + 0.9b * -3) = 0
12 + 7.2b + (12 + -2.7b) = 0

Reorder the terms:
12 + 12 + 7.2b + -2.7b = 0

Combine like terms: 12 + 12 = 24
24 + 7.2b + -2.7b = 0

Combine like terms: 7.2b + -2.7b = 4.5b
24 + 4.5b = 0

Solving
24 + 4.5b = 0

Solving for variable 'b'.

Move all terms containing b to the left, all other terms to the right.

Add '-24' to each side of the equation.
24 + -24 + 4.5b = 0 + -24

Combine like terms: 24 + -24 = 0
0 + 4.5b = 0 + -24
4.5b = 0 + -24

Combine like terms: 0 + -24 = -24
4.5b = -24

Divide each side by '4.5'.
b = -5.333333333

Simplifying
b = -5.333333333

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