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x in (-oo:+oo)
x/4-2 = 5/8 // - 5/8
x/4-(5/8)-2 = 0
x/4-5/8-2 = 0
1/4*x-21/8 = 0 // + 21/8
1/4*x = 21/8 // : 1/4
x = 21/8/1/4
x = 21/2
x = 21/2
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