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y in (-oo:+oo)
y/3+1 = -2.75 // + 2.75
y/3+1+2.75 = 0
1/3*y+3.75 = 0 // - 3.75
1/3*y = -3.75 // : 1/3
y = -3.75/1/3
y = -11.25000011
y = -11.25000011
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