90=15/2a

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Solution for 90=15/2a equation: 


a in (-oo:+oo)

90 = (15/2)*a // - (15/2)*a

90-((15/2)*a) = 0

(-15/2)*a+90 = 0

90-15/2*a = 0 // - 90

-15/2*a = -90 // : -15/2

a = -90/(-15/2)

a = 12

a = 12

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