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x in (-oo:+oo)
x/30 = 2/45 // - 2/45
x/30-(2/45) = 0
x/30-2/45 = 0
1/30*x-2/45 = 0 // + 2/45
1/30*x = 2/45 // : 1/30
x = 2/45/1/30
x = 4/3
x = 4/3
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