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x in (-oo:+oo)
(7*x)/8-((5*x)/6)+3/4 = 0
(7*x)/8+(-5/6)*x+3/4 = 0
1/24*x+3/4 = 0 // - 3/4
1/24*x = -3/4 // : 1/24
x = -3/4/1/24
x = -18
x = -18
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