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x in (-oo:+oo)
26 = (1/5)*x // - (1/5)*x
26-((1/5)*x) = 0
(-1/5)*x+26 = 0
26-1/5*x = 0 // - 26
-1/5*x = -26 // : -1/5
x = -26/(-1/5)
x = 130
x = 130
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