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x in (-oo:+oo)
x/30+12 = x/2 // - x/2
x/30-(x/2)+12 = 0
12-7/15*x = 0 // - 12
-7/15*x = -12 // : -7/15
x = -12/(-7/15)
x = 180/7
x = 180/7
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