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d in (-oo:+oo)
d+3*d+3/5 = -41/15 // + -41/15
d+3*d+3/5-(-41/15) = 0
d+3*d+3/5+41/15 = 0
4*d+10/3 = 0 // - 10/3
4*d = -10/3 // : 4
d = -10/3/4
d = -5/6
d = -5/6
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