3b-(-2b)+-b=12

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Solution for 3b-(-2b)+-b=12 equation: 


Simplifying
3b + -1(-2b) + -1b = 12

Remove parenthesis around (-2b)
3b + -1 * -2b + -1b = 12

Multiply -1 * -2
3b + 2b + -1b = 12

Combine like terms: 3b + 2b = 5b
5b + -1b = 12

Combine like terms: 5b + -1b = 4b
4b = 12

Solving
4b = 12

Solving for variable 'b'.

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

Divide each side by '4'.
b = 3

Simplifying
b = 3

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