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d in (-oo:+oo)
-42 = (1/5)*d-7*d-8 // - (1/5)*d-7*d-8
8-(-7*d)-((1/5)*d)-42 = 0
7*d+(-1/5)*d-42+8 = 0
34/5*d-34 = 0 // + 34
34/5*d = 34 // : 34/5
d = 34/34/5
d = 5
d = 5
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