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x in (-oo:+oo)
(3/4)*x-((3/11)*x)+3/7 = 0
(3/4)*x+(-3/11)*x+3/7 = 0
21/44*x+3/7 = 0 // - 3/7
21/44*x = -3/7 // : 21/44
x = -3/7/21/44
x = -44/49
x = -44/49
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