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x in (-oo:+oo)
(5/12)*(x-5) = 30 // - 30
(5/12)*(x-5)-30 = 0
5/12*(x-5)-30 = 0
5/12*(x-5)-30 = 0
5/12*x-385/12 = 0
5/12*x-385/12 = 0
5/12*x-385/12 = 0 // + 385/12
5/12*x = 385/12 // : 5/12
x = 385/12/5/12
x = 77
x = 77
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