-84=-3(3b+7)

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Solution for -84=-3(3b+7) equation:


Simplifying
-84 = -3(3b + 7)

Reorder the terms:
-84 = -3(7 + 3b)
-84 = (7 * -3 + 3b * -3)
-84 = (-21 + -9b)

Solving
-84 = -21 + -9b

Solving for variable 'b'.

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

Add '9b' to each side of the equation.
-84 + 9b = -21 + -9b + 9b

Combine like terms: -9b + 9b = 0
-84 + 9b = -21 + 0
-84 + 9b = -21

Add '84' to each side of the equation.
-84 + 84 + 9b = -21 + 84

Combine like terms: -84 + 84 = 0
0 + 9b = -21 + 84
9b = -21 + 84

Combine like terms: -21 + 84 = 63
9b = 63

Divide each side by '9'.
b = 7

Simplifying
b = 7

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