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x in (-oo:+oo)
(2/7)*x-((3/4)*x) = -13 // + 13
(2/7)*x-((3/4)*x)+13 = 0
(2/7)*x+(-3/4)*x+13 = 0
13-13/28*x = 0 // - 13
-13/28*x = -13 // : -13/28
x = -13/(-13/28)
x = 28
x = 28
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