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x in (-oo:+oo)
x-((7/5)*x)-9 = 0
x+(-7/5)*x-9 = 0
-2/5*x-9 = 0 // + 9
-2/5*x = 9 // : -2/5
x = 9/(-2/5)
x = -45/2
x = -45/2
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