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x in (-oo:+oo)
x/30 = 123/5 // - 123/5
x/30-(123/5) = 0
x/30-123/5 = 0
1/30*x-123/5 = 0 // + 123/5
1/30*x = 123/5 // : 1/30
x = 123/5/1/30
x = 738
x = 738
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