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y in (-oo:+oo)
(-16/19)*y = -20/28 // + -20/28
(-16/19)*y-(-20/28) = 0
(-16/19)*y+5/7 = 0
5/7-16/19*y = 0 // - 5/7
-16/19*y = -5/7 // : -16/19
y = -5/7/(-16/19)
y = 95/112
y = 95/112
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