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x in (-oo:+oo)
30*x = 5/2 // - 5/2
30*x-(5/2) = 0
30*x-5/2 = 0
30*x-5/2 = 0 // + 5/2
30*x = 5/2 // : 30
x = 5/2/30
x = 1/12
x = 1/12
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