21(a+9)=

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Solution for 21(a+9)= equation:


Simplifying
21(a + 9) = 0

Reorder the terms:
21(9 + a) = 0
(9 * 21 + a * 21) = 0
(189 + 21a) = 0

Solving
189 + 21a = 0

Solving for variable 'a'.

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

Add '-189' to each side of the equation.
189 + -189 + 21a = 0 + -189

Combine like terms: 189 + -189 = 0
0 + 21a = 0 + -189
21a = 0 + -189

Combine like terms: 0 + -189 = -189
21a = -189

Divide each side by '21'.
a = -9

Simplifying
a = -9

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