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x in (-oo:+oo)
x/6 = 7.5/5 // - 7.5/5
x/6-(7.5/5) = 0
x/6-1.5 = 0
1/6*x-1.5 = 0 // + 1.5
1/6*x = 1.5 // : 1/6
x = 1.5/1/6
x = 8.99999982
x = 8.99999982
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