-7(9+4a)=21

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Solution for -7(9+4a)=21 equation: 


Simplifying
-7(9 + 4a) = 21
(9 * -7 + 4a * -7) = 21
(-63 + -28a) = 21

Solving
-63 + -28a = 21

Solving for variable 'a'.

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

Add '63' to each side of the equation.
-63 + 63 + -28a = 21 + 63

Combine like terms: -63 + 63 = 0
0 + -28a = 21 + 63
-28a = 21 + 63

Combine like terms: 21 + 63 = 84
-28a = 84

Divide each side by '-28'.
a = -3

Simplifying
a = -3

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