21a-(9a+27)=

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Solution for 21a-(9a+27)= equation:


Simplifying
21a + -1(9a + 27) = 0

Reorder the terms:
21a + -1(27 + 9a) = 0
21a + (27 * -1 + 9a * -1) = 0
21a + (-27 + -9a) = 0

Reorder the terms:
-27 + 21a + -9a = 0

Combine like terms: 21a + -9a = 12a
-27 + 12a = 0

Solving
-27 + 12a = 0

Solving for variable 'a'.

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

Add '27' to each side of the equation.
-27 + 27 + 12a = 0 + 27

Combine like terms: -27 + 27 = 0
0 + 12a = 0 + 27
12a = 0 + 27

Combine like terms: 0 + 27 = 27
12a = 27

Divide each side by '12'.
a = 2.25

Simplifying
a = 2.25

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