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x in (-oo:+oo)
3*x+5/8 = 7*x+21/8 // - 7*x+21/8
3*x-(7*x)+5/8-(21/8) = 0
3*x-7*x+5/8-21/8 = 0
-4*x-2 = 0 // + 2
-4*x = 2 // : -4
x = 2/(-4)
x = -1/2
x = -1/2
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