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y in (-oo:+oo)
-42 = (-7/4)*y // - (-7/4)*y
-((-7/4)*y)-42 = 0
(7/4)*y-42 = 0
7/4*y-42 = 0 // + 42
7/4*y = 42 // : 7/4
y = 42/7/4
y = 24
y = 24
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