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y in (-oo:+oo)
5.2/3.5 = y/7.5 // - y/7.5
5.2/3.5-(y/7.5) = 0
5.2/3.5-0.13333333*y = 0
1.48571429-0.13333333*y = 0 // - 1.48571429
-0.13333333*y = -1.48571429 // : -0.13333333
y = -1.48571429/(-0.13333333)
y = 11.14285745
y = 11.14285745
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