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x in (-oo:+oo)
(1*x)/3 = 5 // - 5
(1*x)/3-5 = 0
x/3-5 = 0
1/3*x-5 = 0 // + 5
1/3*x = 5 // : 1/3
x = 5/1/3
x = 15
x = 15
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