7a+5a=4(a-8)+12(a+9)

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Solution for 7a+5a=4(a-8)+12(a+9) equation:


Simplifying
7a + 5a = 4(a + -8) + 12(a + 9)

Combine like terms: 7a + 5a = 12a
12a = 4(a + -8) + 12(a + 9)

Reorder the terms:
12a = 4(-8 + a) + 12(a + 9)
12a = (-8 * 4 + a * 4) + 12(a + 9)
12a = (-32 + 4a) + 12(a + 9)

Reorder the terms:
12a = -32 + 4a + 12(9 + a)
12a = -32 + 4a + (9 * 12 + a * 12)
12a = -32 + 4a + (108 + 12a)

Reorder the terms:
12a = -32 + 108 + 4a + 12a

Combine like terms: -32 + 108 = 76
12a = 76 + 4a + 12a

Combine like terms: 4a + 12a = 16a
12a = 76 + 16a

Solving
12a = 76 + 16a

Solving for variable 'a'.

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

Add '-16a' to each side of the equation.
12a + -16a = 76 + 16a + -16a

Combine like terms: 12a + -16a = -4a
-4a = 76 + 16a + -16a

Combine like terms: 16a + -16a = 0
-4a = 76 + 0
-4a = 76

Divide each side by '-4'.
a = -19

Simplifying
a = -19

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