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