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x in (-oo:+oo)
x/30 = 30/150 // - 30/150
x/30-(30/150) = 0
x/30-1/5 = 0
1/30*x-1/5 = 0 // + 1/5
1/30*x = 1/5 // : 1/30
x = 1/5/1/30
x = 6
x = 6
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