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

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Solution for (12+7.2b)-3(0.9-4)= equation: 


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

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

Combine like terms: 0.9 + -4 = -3.1
12 + 7.2b + -3(-3.1) = 0

Multiply -3 * -3.1
12 + 7.2b + 9.3 = 0

Reorder the terms:
12 + 9.3 + 7.2b = 0

Combine like terms: 12 + 9.3 = 21.3
21.3 + 7.2b = 0

Solving
21.3 + 7.2b = 0

Solving for variable 'b'.

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

Add '-21.3' to each side of the equation.
21.3 + -21.3 + 7.2b = 0 + -21.3

Combine like terms: 21.3 + -21.3 = 0.0
0.0 + 7.2b = 0 + -21.3
7.2b = 0 + -21.3

Combine like terms: 0 + -21.3 = -21.3
7.2b = -21.3

Divide each side by '7.2'.
b = -2.958333333

Simplifying
b = -2.958333333

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