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x in (-oo:+oo)
(7/8)*x-((3/5)*x) = 11/12 // - 11/12
(7/8)*x-((3/5)*x)-(11/12) = 0
(7/8)*x+(-3/5)*x-11/12 = 0
11/40*x-11/12 = 0 // + 11/12
11/40*x = 11/12 // : 11/40
x = 11/12/11/40
x = 10/3
x = 10/3
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