-9=-7a-(8a+3)

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Solution for -9=-7a-(8a+3) equation:


Simplifying
-9 = -7a + -1(8a + 3)

Reorder the terms:
-9 = -7a + -1(3 + 8a)
-9 = -7a + (3 * -1 + 8a * -1)
-9 = -7a + (-3 + -8a)

Reorder the terms:
-9 = -3 + -7a + -8a

Combine like terms: -7a + -8a = -15a
-9 = -3 + -15a

Solving
-9 = -3 + -15a

Solving for variable 'a'.

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

Add '15a' to each side of the equation.
-9 + 15a = -3 + -15a + 15a

Combine like terms: -15a + 15a = 0
-9 + 15a = -3 + 0
-9 + 15a = -3

Add '9' to each side of the equation.
-9 + 9 + 15a = -3 + 9

Combine like terms: -9 + 9 = 0
0 + 15a = -3 + 9
15a = -3 + 9

Combine like terms: -3 + 9 = 6
15a = 6

Divide each side by '15'.
a = 0.4

Simplifying
a = 0.4

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