4b-20b+21=0

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Solution for 4b-20b+21=0 equation:


Simplifying
4b + -20b + 21 = 0

Reorder the terms:
21 + 4b + -20b = 0

Combine like terms: 4b + -20b = -16b
21 + -16b = 0

Solving
21 + -16b = 0

Solving for variable 'b'.

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

Add '-21' to each side of the equation.
21 + -21 + -16b = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -16b = 0 + -21
-16b = 0 + -21

Combine like terms: 0 + -21 = -21
-16b = -21

Divide each side by '-16'.
b = 1.3125

Simplifying
b = 1.3125

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