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x in (-oo:+oo)
2/90 = 3*x // - 3*x
2/90-(3*x) = 0
2/90-3*x = 0
1/45-3*x = 0 // - 1/45
-3*x = -1/45 // : -3
x = -1/45/(-3)
x = 1/135
x = 1/135
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