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x in (-oo:+oo)
(-1/2)*(x+3) = -16 // + 16
(-1/2)*(x+3)+16 = 0
16-1/2*(x+3) = 0
16-1/2*(x+3) = 0
29/2-1/2*x = 0
29/2-1/2*x = 0
29/2-1/2*x = 0 // - 29/2
-1/2*x = -29/2 // : -1/2
x = -29/2/(-1/2)
x = 29
x = 29
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