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x in (-oo:+oo)
-16 = (4/13)*x // - (4/13)*x
-((4/13)*x)-16 = 0
(-4/13)*x-16 = 0
-4/13*x-16 = 0 // + 16
-4/13*x = 16 // : -4/13
x = 16/(-4/13)
x = -52
x = -52
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