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x in (-oo:+oo)
x/6 = 5/7.5 // - 5/7.5
x/6-(5/7.5) = 0
x/6-0.66666667 = 0
1/6*x-0.66666667 = 0 // + 0.66666667
1/6*x = 0.66666667 // : 1/6
x = 0.66666667/1/6
x = 3.99999994
x = 3.99999994
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