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x in (-oo:+oo)
1.5 = x/30 // - x/30
1.5-(x/30) = 0
1.5-1/30*x = 0 // - 1.5
-1/30*x = -1.5 // : -1/30
x = -1.5/(-1/30)
x = 45.0000045
x = 45.0000045
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