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y in (-oo:+oo)
y = -0.4*(13/5)-6 // + -0.4*(13/5)-6
y-(-0.4*(13/5))+6 = 0
y+1.04+6 = 0
y+7.04 = 0 // - 7.04
y = -7.04
y = -7.04
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