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x in (-oo:+oo)
26 = x/4+3*x // - x/4+3*x
26-(x/4)-(3*x) = 0
26-(x/4)-3*x = 0
26-13/4*x = 0 // - 26
-13/4*x = -26 // : -13/4
x = -26/(-13/4)
x = 8
x = 8
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