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x in (-oo:+oo)
(1/2)*(x+8) = -5 // + 5
(1/2)*(x+8)+5 = 0
1/2*(x+8)+5 = 0
1/2*(x+8)+5 = 0
1/2*x+9 = 0
1/2*x+9 = 0
1/2*x+9 = 0 // - 9
1/2*x = -9 // : 1/2
x = -9/1/2
x = -18
x = -18
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