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x in (-oo:+oo)
(-1/2)*(x+2) = 13 // - 13
(-1/2)*(x+2)-13 = 0
-1/2*(x+2)-13 = 0
-1/2*(x+2)-13 = 0
-1/2*x-14 = 0
-1/2*x-14 = 0
-1/2*x-14 = 0 // + 14
-1/2*x = 14 // : -1/2
x = 14/(-1/2)
x = -28
x = -28
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