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x in (-oo:+oo)
(5/3)*x = -15/7 // + -15/7
(5/3)*x-(-15/7) = 0
(5/3)*x+15/7 = 0
5/3*x+15/7 = 0 // - 15/7
5/3*x = -15/7 // : 5/3
x = -15/7/5/3
x = -9/7
x = -9/7
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