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x in (-oo:+oo)
(2/3)*x+3/5 = 4/15 // - 4/15
(2/3)*x+3/5-(4/15) = 0
(2/3)*x+3/5-4/15 = 0
2/3*x+1/3 = 0 // - 1/3
2/3*x = -1/3 // : 2/3
x = -1/3/2/3
x = -1/2
x = -1/2
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