3/4-4a=21/4

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Solution for 3/4-4a=21/4 equation: 


a in (-oo:+oo)

3/4-(4*a) = 21/4 // - 21/4

3/4-(4*a)-(21/4) = 0

3/4-4*a-21/4 = 0

-4*a-9/2 = 0 // + 9/2

-4*a = 9/2 // : -4

a = 9/2/(-4)

a = -9/8

a = -9/8

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