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