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x in (-oo:+oo)
13 = (1/4)*x // - (1/4)*x
13-((1/4)*x) = 0
(-1/4)*x+13 = 0
13-1/4*x = 0 // - 13
-1/4*x = -13 // : -1/4
x = -13/(-1/4)
x = 52
x = 52
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