28=-4a+7a+1

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Solution for 28=-4a+7a+1 equation: 


a in (-oo:+oo)

28 = 7*a-4*a+1 // - 7*a-4*a+1

28-(-4*a)-(7*a)-1 = 0

4*a-7*a-1+28 = 0

27-3*a = 0 // - 27

-3*a = -27 // : -3

a = -27/(-3)

a = 9

a = 9

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