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y in (-oo:+oo)
9 = y/3.84+6 // - y/3.84+6
9-(y/3.84)-6 = 0
9-0.26041667*y-6 = 0
3-0.26041667*y = 0 // - 3
-0.26041667*y = -3 // : -0.26041667
y = -3/(-0.26041667)
y = 11.51999985
y = 11.51999985
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