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x in (-oo:+oo)
x-(1/5) = 3*x+7/15 // - 3*x+7/15
x-(3*x)-(1/5)-(7/15) = 0
x-3*x-1/5-7/15 = 0
-2*x-2/3 = 0 // + 2/3
-2*x = 2/3 // : -2
x = 2/3/(-2)
x = -1/3
x = -1/3
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