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y in (-oo:+oo)
4.25/5.2 = y/6.16 // - y/6.16
4.25/5.2-(y/6.16) = 0
4.25/5.2-0.16233766*y = 0
0.81730769-0.16233766*y = 0 // - 0.81730769
-0.16233766*y = -0.81730769 // : -0.16233766
y = -0.81730769/(-0.16233766)
y = 5.03461544
y = 5.03461544
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