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x in (-oo:+oo)
6*(x-4) = 78/13 // - 78/13
6*(x-4)-(78/13) = 0
6*(x-4)-6 = 0
6*(x-4)-6 = 0
6*x-30 = 0
6*x-30 = 0
6*x-30 = 0 // + 30
6*x = 30 // : 6
x = 30/6
x = 5
x = 5
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