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y in (-oo:+oo)
y/4 = -5.12 // + 5.12
y/4+5.12 = 0
1/4*y+5.12 = 0 // - 5.12
1/4*y = -5.12 // : 1/4
y = -5.12/1/4
y = -20.48
y = -20.48
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