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x in (-oo:+oo)
3/4+5/8 = 4*x // - 4*x
3/4-(4*x)+5/8 = 0
3/4-4*x+5/8 = 0
11/8-4*x = 0 // - 11/8
-4*x = -11/8 // : -4
x = -11/8/(-4)
x = 11/32
x = 11/32
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