-7(3+9b)=21

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Solution for -7(3+9b)=21 equation: 


Simplifying
-7(3 + 9b) = 21
(3 * -7 + 9b * -7) = 21
(-21 + -63b) = 21

Solving
-21 + -63b = 21

Solving for variable 'b'.

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

Add '21' to each side of the equation.
-21 + 21 + -63b = 21 + 21

Combine like terms: -21 + 21 = 0
0 + -63b = 21 + 21
-63b = 21 + 21

Combine like terms: 21 + 21 = 42
-63b = 42

Divide each side by '-63'.
b = -0.6666666667

Simplifying
b = -0.6666666667

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