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d in (-oo:+oo)
d/3+5 = d/4-7 // - d/4-7
d/3-(d/4)+5+7 = 0
1/12*d+12 = 0 // - 12
1/12*d = -12 // : 1/12
d = -12/1/12
d = -144
d = -144
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