7(7-4a)=-91

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Solution for 7(7-4a)=-91 equation: 


a in (-oo:+oo)

7*(7-(4*a)) = -91 // + 91

7*(7-(4*a))+91 = 0

7*(7-4*a)+91 = 0

7*(7-4*a)+91 = 0

140-28*a = 0

140-28*a = 0

140-28*a = 0 // - 140

-28*a = -140 // : -28

a = -140/(-28)

a = 5

a = 5

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