-15=-3(-4+b)

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Solution for -15=-3(-4+b) equation:


Simplifying
-15 = -3(-4 + b)
-15 = (-4 * -3 + b * -3)
-15 = (12 + -3b)

Solving
-15 = 12 + -3b

Solving for variable 'b'.

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

Add '3b' to each side of the equation.
-15 + 3b = 12 + -3b + 3b

Combine like terms: -3b + 3b = 0
-15 + 3b = 12 + 0
-15 + 3b = 12

Add '15' to each side of the equation.
-15 + 15 + 3b = 12 + 15

Combine like terms: -15 + 15 = 0
0 + 3b = 12 + 15
3b = 12 + 15

Combine like terms: 12 + 15 = 27
3b = 27

Divide each side by '3'.
b = 9

Simplifying
b = 9

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