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x in (-oo:+oo)
2/3 = x/45 // - x/45
2/3-(x/45) = 0
2/3-1/45*x = 0 // - 2/3
-1/45*x = -2/3 // : -1/45
x = -2/3/(-1/45)
x = 30
x = 30
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