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x in (-oo:+oo)
x/8 = x/9-15 // - x/9-15
x/8-(x/9)+15 = 0
1/72*x+15 = 0 // - 15
1/72*x = -15 // : 1/72
x = -15/1/72
x = -1080
x = -1080
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