b-3(5-b)=21

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Solution for b-3(5-b)=21 equation:


Simplifying
b + -3(5 + -1b) = 21
b + (5 * -3 + -1b * -3) = 21
b + (-15 + 3b) = 21

Reorder the terms:
-15 + b + 3b = 21

Combine like terms: b + 3b = 4b
-15 + 4b = 21

Solving
-15 + 4b = 21

Solving for variable 'b'.

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

Add '15' to each side of the equation.
-15 + 15 + 4b = 21 + 15

Combine like terms: -15 + 15 = 0
0 + 4b = 21 + 15
4b = 21 + 15

Combine like terms: 21 + 15 = 36
4b = 36

Divide each side by '4'.
b = 9

Simplifying
b = 9

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