28=7a-4a+7

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


a in (-oo:+oo)

28 = 7*a-(4*a)+7 // - 7*a-(4*a)+7

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

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

21-3*a = 0 // - 21

-3*a = -21 // : -3

a = -21/(-3)

a = 7

a = 7

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