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x in (-oo:+oo)
(-1/2)*x+5 = 87/16 // - 87/16
(-1/2)*x-(87/16)+5 = 0
(-1/2)*x-87/16+5 = 0
-1/2*x-7/16 = 0 // + 7/16
-1/2*x = 7/16 // : -1/2
x = 7/16/(-1/2)
x = -7/8
x = -7/8
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