3a+5-8a=7-9a-12

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Solution for 3a+5-8a=7-9a-12 equation:


Simplifying
3a + 5 + -8a = 7 + -9a + -12

Reorder the terms:
5 + 3a + -8a = 7 + -9a + -12

Combine like terms: 3a + -8a = -5a
5 + -5a = 7 + -9a + -12

Reorder the terms:
5 + -5a = 7 + -12 + -9a

Combine like terms: 7 + -12 = -5
5 + -5a = -5 + -9a

Solving
5 + -5a = -5 + -9a

Solving for variable 'a'.

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

Add '9a' to each side of the equation.
5 + -5a + 9a = -5 + -9a + 9a

Combine like terms: -5a + 9a = 4a
5 + 4a = -5 + -9a + 9a

Combine like terms: -9a + 9a = 0
5 + 4a = -5 + 0
5 + 4a = -5

Add '-5' to each side of the equation.
5 + -5 + 4a = -5 + -5

Combine like terms: 5 + -5 = 0
0 + 4a = -5 + -5
4a = -5 + -5

Combine like terms: -5 + -5 = -10
4a = -10

Divide each side by '4'.
a = -2.5

Simplifying
a = -2.5

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