20a+15-8=2a+5-9

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Solution for 20a+15-8=2a+5-9 equation:


Simplifying
20a + 15 + -8 = 2a + 5 + -9

Reorder the terms:
15 + -8 + 20a = 2a + 5 + -9

Combine like terms: 15 + -8 = 7
7 + 20a = 2a + 5 + -9

Reorder the terms:
7 + 20a = 5 + -9 + 2a

Combine like terms: 5 + -9 = -4
7 + 20a = -4 + 2a

Solving
7 + 20a = -4 + 2a

Solving for variable 'a'.

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

Add '-2a' to each side of the equation.
7 + 20a + -2a = -4 + 2a + -2a

Combine like terms: 20a + -2a = 18a
7 + 18a = -4 + 2a + -2a

Combine like terms: 2a + -2a = 0
7 + 18a = -4 + 0
7 + 18a = -4

Add '-7' to each side of the equation.
7 + -7 + 18a = -4 + -7

Combine like terms: 7 + -7 = 0
0 + 18a = -4 + -7
18a = -4 + -7

Combine like terms: -4 + -7 = -11
18a = -11

Divide each side by '18'.
a = -0.6111111111

Simplifying
a = -0.6111111111

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