-720=-20(-4b)

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Solution for -720=-20(-4b) equation:


Simplifying
-720 = -20(-4b)

Remove parenthesis around (-4b)
-720 = -20 * -4b

Multiply -20 * -4
-720 = 80b

Solving
-720 = 80b

Solving for variable 'b'.

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

Add '-80b' to each side of the equation.
-720 + -80b = 80b + -80b

Combine like terms: 80b + -80b = 0
-720 + -80b = 0

Add '720' to each side of the equation.
-720 + 720 + -80b = 0 + 720

Combine like terms: -720 + 720 = 0
0 + -80b = 0 + 720
-80b = 0 + 720

Combine like terms: 0 + 720 = 720
-80b = 720

Divide each side by '-80'.
b = -9

Simplifying
b = -9

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