15=a+1-8-18

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Solution for 15=a+1-8-18 equation: 


Simplifying
15 = a + 1 + -8 + -18

Reorder the terms:
15 = 1 + -8 + -18 + a

Combine like terms: 1 + -8 = -7
15 = -7 + -18 + a

Combine like terms: -7 + -18 = -25
15 = -25 + a

Solving
15 = -25 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
15 + -1a = -25 + a + -1a

Combine like terms: a + -1a = 0
15 + -1a = -25 + 0
15 + -1a = -25

Add '-15' to each side of the equation.
15 + -15 + -1a = -25 + -15

Combine like terms: 15 + -15 = 0
0 + -1a = -25 + -15
-1a = -25 + -15

Combine like terms: -25 + -15 = -40
-1a = -40

Divide each side by '-1'.
a = 40

Simplifying
a = 40

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