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y in (-oo:+oo)
126-y = (2/5)*y // - (2/5)*y
126-y-((2/5)*y) = 0
(-2/5)*y-y+126 = 0
126-7/5*y = 0 // - 126
-7/5*y = -126 // : -7/5
y = -126/(-7/5)
y = 90
y = 90
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