a-9=2+4(7a+4)

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Solution for a-9=2+4(7a+4) equation:


Simplifying
a + -9 = 2 + 4(7a + 4)

Reorder the terms:
-9 + a = 2 + 4(7a + 4)

Reorder the terms:
-9 + a = 2 + 4(4 + 7a)
-9 + a = 2 + (4 * 4 + 7a * 4)
-9 + a = 2 + (16 + 28a)

Combine like terms: 2 + 16 = 18
-9 + a = 18 + 28a

Solving
-9 + a = 18 + 28a

Solving for variable 'a'.

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

Add '-28a' to each side of the equation.
-9 + a + -28a = 18 + 28a + -28a

Combine like terms: a + -28a = -27a
-9 + -27a = 18 + 28a + -28a

Combine like terms: 28a + -28a = 0
-9 + -27a = 18 + 0
-9 + -27a = 18

Add '9' to each side of the equation.
-9 + 9 + -27a = 18 + 9

Combine like terms: -9 + 9 = 0
0 + -27a = 18 + 9
-27a = 18 + 9

Combine like terms: 18 + 9 = 27
-27a = 27

Divide each side by '-27'.
a = -1

Simplifying
a = -1

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