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x in (-oo:+oo)
x/30 = 1/10 // - 1/10
x/30-(1/10) = 0
x/30-1/10 = 0
1/30*x-1/10 = 0 // + 1/10
1/30*x = 1/10 // : 1/30
x = 1/10/1/30
x = 3
x = 3
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