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d in (-oo:+oo)
3/4-((1/2)*d) = (3/7)*d+59/70 // - (3/7)*d+59/70
3/4-((1/2)*d)-((3/7)*d)-(59/70) = 0
(-1/2)*d+(-3/7)*d+3/4-59/70 = 0
-13/14*d-13/140 = 0 // + 13/140
-13/14*d = 13/140 // : -13/14
d = 13/140/(-13/14)
d = -1/10
d = -1/10
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