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x in (-oo:+oo)
(8*x+9)/(-7) = -15 // + 15
(8*x+9)/(-7)+15 = 0
(8*x+9)/(-7)+(-7*15)/(-7) = 0
8*x-7*15+9 = 0
8*x-96 = 0
(8*x-96)/(-7) = 0
(8*x-96)/(-7) = 0 // * -7
8*x-96 = 0
8*x-96 = 0 // + 96
8*x = 96 // : 8
x = 96/8
x = 12
x = 12
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