a-5+2a-8a=15

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


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

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

Combine like terms: a + 2a = 3a
-5 + 3a + -8a = 15

Combine like terms: 3a + -8a = -5a
-5 + -5a = 15

Solving
-5 + -5a = 15

Solving for variable 'a'.

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

Add '5' to each side of the equation.
-5 + 5 + -5a = 15 + 5

Combine like terms: -5 + 5 = 0
0 + -5a = 15 + 5
-5a = 15 + 5

Combine like terms: 15 + 5 = 20
-5a = 20

Divide each side by '-5'.
a = -4

Simplifying
a = -4

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