21b+-b+-13b=-28

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Solution for 21b+-b+-13b=-28 equation: 


Simplifying
21b + -1b + -13b = -28

Combine like terms: 21b + -1b = 20b
20b + -13b = -28

Combine like terms: 20b + -13b = 7b
7b = -28

Solving
7b = -28

Solving for variable 'b'.

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

Divide each side by '7'.
b = -4

Simplifying
b = -4

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