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d in (-oo:+oo)
(-2/5)*d-4 = -34/5 // + -34/5
(-2/5)*d-(-34/5)-4 = 0
(-2/5)*d+34/5-4 = 0
14/5-2/5*d = 0 // - 14/5
-2/5*d = -14/5 // : -2/5
d = -14/5/(-2/5)
d = 7
d = 7
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