18=15+a

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Solution for 18=15+a equation:


18=15+a

We simplify the equation to the form, which is simple to understand 
18=15+a

We move all terms containing a to the left and all other terms to the right. 
-1a=+15-18

We simplify left and right side of the equation. 
-1a=-3

We divide both sides of the equation by -01 to get a. 
a=3

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