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d in (-oo:+oo)
(1/10)*(2*d+2) = 4.8-(0.6*d)-3 // - 4.8-(0.6*d)-3
(1/10)*(2*d+2)+0.6*d-4.8+3 = 0
1/10*(2*d+2)+0.6*d-4.8+3 = 0
1/10*(2*d+2)+0.6*d-4.8+3 = 0
0.8*d-4.8+1/5+3 = 0
0.8*d-4.6+3 = 0
0.8*d-1.6 = 0
0.8*d-1.6 = 0
0.8*d-1.6 = 0 // + 1.6
0.8*d = 1.6 // : 0.8
d = 1.6/0.8
d = 2
d = 2
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