12*12+a=15*15

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Solution for 12*12+a=15*15 equation:


12*12+a=15*15

We simplify the equation to the form, which is simple to understand 
12*12+a=15*15

We move all terms containing a to the left and all other terms to the right. 
+1a=+225-144

We simplify left and right side of the equation. 
+1a=+81

We divide both sides of the equation by 1 to get a. 
a=81

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