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