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x in (-oo:+oo)
X/5 = x/6-13 // - x/6-13
X/5-(x/6)+13 = 0
1/5*X-1/6*x+13 = 0 // - 1/5*X+13
-1/6*x = -(1/5*X+13) // : -1/6
x = (-(1/5*X+13))/(-1/6)
x = 6*(1/5*X+13)
x = 6*(1/5*X+13)
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