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y in (-oo:+oo)
y = 25/4-(25/10)-4 // - 25/4-(25/10)-4
y-(25/4)+25/10+4 = 0
y-25/4+25/10+4 = 0
y+1/4 = 0 // - 1/4
y = -1/4
y = -1/4
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