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x in (-oo:+oo)
x^2-((5/12)*x)-(7/8) = 0
x^2+(-5/12)*x-7/8 = 0
x^2-5/12*x-7/8 = 0
DELTA = (-5/12)^2-(-7/8*1*4)
DELTA = 529/144
DELTA > 0
x = ((529/144)^(1/2)+5/12)/(1*2) or x = (5/12-(529/144)^(1/2))/(1*2)
x = 7/6 or x = -3/4
x in { -3/4, 7/6 }
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