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x in (-oo:+oo)
x/450 = 4/6 // - 4/6
x/450-(4/6) = 0
x/450-2/3 = 0
1/450*x-2/3 = 0 // + 2/3
1/450*x = 2/3 // : 1/450
x = 2/3/1/450
x = 300
x = 300
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