18+a=3

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Solution for 18+a=3 equation: 


Simplifying
18 + a = 3

Solving
18 + a = 3

Solving for variable 'a'.

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

Add '-18' to each side of the equation.
18 + -18 + a = 3 + -18

Combine like terms: 18 + -18 = 0
0 + a = 3 + -18
a = 3 + -18

Combine like terms: 3 + -18 = -15
a = -15

Simplifying
a = -15

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