21=6a-a+1

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Solution for 21=6a-a+1 equation: 


a in (-oo:+oo)

21 = 6*a-a+1 // - 6*a-a+1

a-(6*a)-1+21 = 0

a-6*a-1+21 = 0

20-5*a = 0 // - 20

-5*a = -20 // : -5

a = -20/(-5)

a = 4

a = 4

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