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y in (-oo:+oo)
3.1 = -y/4 // + -y/4
3.1-(-y/4) = 0
(1/4)*y+3.1 = 0
1/4*y+3.1 = 0 // - 3.1
1/4*y = -3.1 // : 1/4
y = -3.1/1/4
y = -12.4
y = -12.4
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