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x in (-oo:+oo)
1/2 = 18*x-30 // - 18*x-30
1/2-(18*x)+30 = 0
1/2-18*x+30 = 0
61/2-18*x = 0 // - 61/2
-18*x = -61/2 // : -18
x = -61/2/(-18)
x = 61/36
x = 61/36
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