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x in (-oo:+oo)
-4 = (5*x)/3 // - (5*x)/3
-((5*x)/3)-4 = 0
(-5/3)*x-4 = 0
-5/3*x-4 = 0 // + 4
-5/3*x = 4 // : -5/3
x = 4/(-5/3)
x = -12/5
x = -12/5
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