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x in (-oo:+oo)
x-((x/10)/13) = 12 // - 12
x-((x/10)/13)-12 = 0
x+(-1/130)*x-12 = 0
129/130*x-12 = 0 // + 12
129/130*x = 12 // : 129/130
x = 12/129/130
x = 520/43
x = 520/43
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