-12=7(2a-3)-(8a-9)

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Solution for -12=7(2a-3)-(8a-9) equation:


Simplifying
-12 = 7(2a + -3) + -1(8a + -9)

Reorder the terms:
-12 = 7(-3 + 2a) + -1(8a + -9)
-12 = (-3 * 7 + 2a * 7) + -1(8a + -9)
-12 = (-21 + 14a) + -1(8a + -9)

Reorder the terms:
-12 = -21 + 14a + -1(-9 + 8a)
-12 = -21 + 14a + (-9 * -1 + 8a * -1)
-12 = -21 + 14a + (9 + -8a)

Reorder the terms:
-12 = -21 + 9 + 14a + -8a

Combine like terms: -21 + 9 = -12
-12 = -12 + 14a + -8a

Combine like terms: 14a + -8a = 6a
-12 = -12 + 6a

Add '12' to each side of the equation.
-12 + 12 = -12 + 12 + 6a

Combine like terms: -12 + 12 = 0
0 = -12 + 12 + 6a

Combine like terms: -12 + 12 = 0
0 = 0 + 6a
0 = 6a

Solving
0 = 6a

Solving for variable 'a'.

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

Add '-6a' to each side of the equation.
0 + -6a = 6a + -6a
Remove the zero:
-6a = 6a + -6a

Combine like terms: 6a + -6a = 0
-6a = 0

Divide each side by '-6'.
a = 0

Simplifying
a = 0

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