3/4(12+4a)=21

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Solution for 3/4(12+4a)=21 equation: 


a in (-oo:+oo)

(3/4)*(4*a+12) = 21 // - 21

(3/4)*(4*a+12)-21 = 0

3/4*(4*a+12)-21 = 0

3/4*(4*a+12)-21 = 0

3*a-12 = 0

3*a-12 = 0

3*a-12 = 0 // + 12

3*a = 12 // : 3

a = 12/3

a = 4

a = 4

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