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d in (-oo:+oo)
d/0.2 = 3*d+2.1 // - 3*d+2.1
d/0.2-(3*d)-2.1 = 0
d/0.2-3*d-2.1 = 0
2*d-2.1 = 0 // + 2.1
2*d = 2.1 // : 2
d = 2.1/2
d = 1.05
d = 1.05
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