3(-5a-7)=99

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Solution for 3(-5a-7)=99 equation: 


a in (-oo:+oo)

3*(-5*a-7) = 99 // - 99

3*(-5*a-7)-99 = 0

3*(-5*a-7)-99 = 0

-15*a-120 = 0

-15*a-120 = 0

-15*a-120 = 0 // + 120

-15*a = 120 // : -15

a = 120/(-15)

a = -8

a = -8

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