(21-1)(4a+a)-12=

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Solution for (21-1)(4a+a)-12= equation:


Simplifying
(21 + -1)(4a + a) + -12 = 0

Combine like terms: 21 + -1 = 20
(20)(4a + a) + -12 = 0

Combine like terms: 4a + a = 5a
20(5a) + -12 = 0

Remove parenthesis around (5a)
20 * 5a + -12 = 0

Multiply 20 * 5
100a + -12 = 0

Reorder the terms:
-12 + 100a = 0

Solving
-12 + 100a = 0

Solving for variable 'a'.

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

Add '12' to each side of the equation.
-12 + 12 + 100a = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 100a = 0 + 12
100a = 0 + 12

Combine like terms: 0 + 12 = 12
100a = 12

Divide each side by '100'.
a = 0.12

Simplifying
a = 0.12

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