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x in (-oo:+oo)
-13/28 = 4*x-(3*x)+2/7 // - 4*x-(3*x)+2/7
3*x-(4*x)-13/28-(2/7) = 0
3*x-4*x-13/28-2/7 = 0
-x-3/4 = 0 // + 3/4
-x = 3/4 // * -1
x = -3/4
x = -3/4
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