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x in (-oo:+oo)
x-((7/5)*x)-8 = 0
x+(-7/5)*x-8 = 0
-2/5*x-8 = 0 // + 8
-2/5*x = 8 // : -2/5
x = 8/(-2/5)
x = -20
x = -20
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