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d in (-oo:+oo)
3*(1-5*d) = -147 // + 147
3*(1-5*d)+147 = 0
3*(1-5*d)+147 = 0
150-15*d = 0
150-15*d = 0
150-15*d = 0 // - 150
-15*d = -150 // : -15
d = -150/(-15)
d = 10
d = 10
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