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x in (-oo:+oo)
0.15 = x/30 // - x/30
0.15-(x/30) = 0
0.15-1/30*x = 0 // - 0.15
-1/30*x = -0.15 // : -1/30
x = -0.15/(-1/30)
x = 4.50000045
x = 4.50000045
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