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x in (-oo:+oo)
(-5/3)*x = -25/9 // + -25/9
(-5/3)*x-(-25/9) = 0
(-5/3)*x+25/9 = 0
25/9-5/3*x = 0 // - 25/9
-5/3*x = -25/9 // : -5/3
x = -25/9/(-5/3)
x = 5/3
x = 5/3
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