7-7a-2a=-20

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Solution for 7-7a-2a=-20 equation: 


a in (-oo:+oo)

7-(7*a)-(2*a) = -20 // + 20

7-(7*a)-(2*a)+20 = 0

7-7*a-2*a+20 = 0

27-9*a = 0 // - 27

-9*a = -27 // : -9

a = -27/(-9)

a = 3

a = 3

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