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x in (-oo:+oo)
(-5/3)*x-1 = 4 // - 4
(-5/3)*x-4-1 = 0
-5/3*x-5 = 0 // + 5
-5/3*x = 5 // : -5/3
x = 5/(-5/3)
x = -3
x = -3
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