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z in (-oo:+oo)
1-13 = (1*z)/3 // - (1*z)/3
1-((1*z)/3)-13 = 0
1-(z/3)-13 = 0
-1/3*z-12 = 0 // + 12
-1/3*z = 12 // : -1/3
z = 12/(-1/3)
z = -36
z = -36
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