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x in (-oo:+oo)
x/4-9 = 3/8 // - 3/8
x/4-(3/8)-9 = 0
x/4-3/8-9 = 0
1/4*x-75/8 = 0 // + 75/8
1/4*x = 75/8 // : 1/4
x = 75/8/1/4
x = 75/2
x = 75/2
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