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x in (-oo:+oo)
(-5/3)*x = -10/9 // + -10/9
(-5/3)*x-(-10/9) = 0
(-5/3)*x+10/9 = 0
10/9-5/3*x = 0 // - 10/9
-5/3*x = -10/9 // : -5/3
x = -10/9/(-5/3)
x = 2/3
x = 2/3
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