b+4(b-1)=21

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Solution for b+4(b-1)=21 equation:


Simplifying
b + 4(b + -1) = 21

Reorder the terms:
b + 4(-1 + b) = 21
b + (-1 * 4 + b * 4) = 21
b + (-4 + 4b) = 21

Reorder the terms:
-4 + b + 4b = 21

Combine like terms: b + 4b = 5b
-4 + 5b = 21

Solving
-4 + 5b = 21

Solving for variable 'b'.

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

Add '4' to each side of the equation.
-4 + 4 + 5b = 21 + 4

Combine like terms: -4 + 4 = 0
0 + 5b = 21 + 4
5b = 21 + 4

Combine like terms: 21 + 4 = 25
5b = 25

Divide each side by '5'.
b = 5

Simplifying
b = 5

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