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x in (-oo:+oo)
x/240 = 45/270 // - 45/270
x/240-(45/270) = 0
x/240-1/6 = 0
1/240*x-1/6 = 0 // + 1/6
1/240*x = 1/6 // : 1/240
x = 1/6/1/240
x = 40
x = 40
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