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x in (-oo:+oo)
x/30 = 5/6 // - 5/6
x/30-(5/6) = 0
x/30-5/6 = 0
1/30*x-5/6 = 0 // + 5/6
1/30*x = 5/6 // : 1/30
x = 5/6/1/30
x = 25
x = 25
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