15-1/2a=1/4a

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Solution for 15-1/2a=1/4a equation: 


a in (-oo:+oo)

15-((1/2)*a) = (1/4)*a // - (1/4)*a

15-((1/2)*a)-((1/4)*a) = 0

(-1/2)*a+(-1/4)*a+15 = 0

15-3/4*a = 0 // - 15

-3/4*a = -15 // : -3/4

a = -15/(-3/4)

a = 20

a = 20

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