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x in (-oo:+oo)
6*(x-6) = 78/13 // - 78/13
6*(x-6)-(78/13) = 0
6*(x-6)-6 = 0
6*(x-6)-6 = 0
6*x-42 = 0
6*x-42 = 0
6*x-42 = 0 // + 42
6*x = 42 // : 6
x = 42/6
x = 7
x = 7
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