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x in (-oo:+oo)
(-1/3)*x+5/8 = 29/8 // - 29/8
(-1/3)*x+5/8-(29/8) = 0
(-1/3)*x+5/8-29/8 = 0
-1/3*x-3 = 0 // + 3
-1/3*x = 3 // : -1/3
x = 3/(-1/3)
x = -9
x = -9
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