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x in (-oo:+oo)
x/6 = 10/15 // - 10/15
x/6-(10/15) = 0
x/6-2/3 = 0
1/6*x-2/3 = 0 // + 2/3
1/6*x = 2/3 // : 1/6
x = 2/3/1/6
x = 4
x = 4
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