-21=-3(b+10)

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Solution for -21=-3(b+10) equation:


Simplifying
-21 = -3(b + 10)

Reorder the terms:
-21 = -3(10 + b)
-21 = (10 * -3 + b * -3)
-21 = (-30 + -3b)

Solving
-21 = -30 + -3b

Solving for variable 'b'.

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

Add '3b' to each side of the equation.
-21 + 3b = -30 + -3b + 3b

Combine like terms: -3b + 3b = 0
-21 + 3b = -30 + 0
-21 + 3b = -30

Add '21' to each side of the equation.
-21 + 21 + 3b = -30 + 21

Combine like terms: -21 + 21 = 0
0 + 3b = -30 + 21
3b = -30 + 21

Combine like terms: -30 + 21 = -9
3b = -9

Divide each side by '3'.
b = -3

Simplifying
b = -3

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