8/4a-15/2=21

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Solution for 8/4a-15/2=21 equation: 


a in (-oo:+oo)

(8/4)*a-(15/2) = 21 // - 21

(8/4)*a-(15/2)-21 = 0

(8/4)*a-15/2-21 = 0

2*a-57/2 = 0 // + 57/2

2*a = 57/2 // : 2

a = 57/2/2

a = 57/4

a = 57/4

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