-7b*(-3b)=

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Solution for -7b*(-3b)= equation: 


Simplifying
-7b(-3b) = 0

Remove parenthesis around (-3b)
-7b * -3b = 0

Reorder the terms for easier multiplication:
-7 * -3b * b = 0

Multiply -7 * -3
21b * b = 0

Multiply b * b
21b2 = 0

Solving
21b2 = 0

Solving for variable 'b'.

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

Divide each side by '21'.
b2 = 0

Simplifying
b2 = 0

Take the square root of each side:
b = {0}

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