12=4a+2b+(-a+b-9)

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Solution for 12=4a+2b+(-a+b-9) equation:


Simplifying
12 = 4a + 2b + (-1a + b + -9)

Reorder the terms:
12 = 4a + 2b + (-9 + -1a + b)

Remove parenthesis around (-9 + -1a + b)
12 = 4a + 2b + -9 + -1a + b

Reorder the terms:
12 = -9 + 4a + -1a + 2b + b

Combine like terms: 4a + -1a = 3a
12 = -9 + 3a + 2b + b

Combine like terms: 2b + b = 3b
12 = -9 + 3a + 3b

Solving
12 = -9 + 3a + 3b

Solving for variable 'a'.

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

Add '-3a' to each side of the equation.
12 + -3a = -9 + 3a + -3a + 3b

Combine like terms: 3a + -3a = 0
12 + -3a = -9 + 0 + 3b
12 + -3a = -9 + 3b

Add '-12' to each side of the equation.
12 + -12 + -3a = -9 + -12 + 3b

Combine like terms: 12 + -12 = 0
0 + -3a = -9 + -12 + 3b
-3a = -9 + -12 + 3b

Combine like terms: -9 + -12 = -21
-3a = -21 + 3b

Divide each side by '-3'.
a = 7 + -1b

Simplifying
a = 7 + -1b

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