-21+7b=4(2b-4)

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Solution for -21+7b=4(2b-4) equation:


Simplifying
-21 + 7b = 4(2b + -4)

Reorder the terms:
-21 + 7b = 4(-4 + 2b)
-21 + 7b = (-4 * 4 + 2b * 4)
-21 + 7b = (-16 + 8b)

Solving
-21 + 7b = -16 + 8b

Solving for variable 'b'.

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

Add '-8b' to each side of the equation.
-21 + 7b + -8b = -16 + 8b + -8b

Combine like terms: 7b + -8b = -1b
-21 + -1b = -16 + 8b + -8b

Combine like terms: 8b + -8b = 0
-21 + -1b = -16 + 0
-21 + -1b = -16

Add '21' to each side of the equation.
-21 + 21 + -1b = -16 + 21

Combine like terms: -21 + 21 = 0
0 + -1b = -16 + 21
-1b = -16 + 21

Combine like terms: -16 + 21 = 5
-1b = 5

Divide each side by '-1'.
b = -5

Simplifying
b = -5

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