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h in (-oo:+oo)
(-1/2)*(h+12) = 7 // - 7
(-1/2)*(h+12)-7 = 0
-1/2*(h+12)-7 = 0
-1/2*(h+12)-7 = 0
-1/2*h-13 = 0
-1/2*h-13 = 0
-1/2*h-13 = 0 // + 13
-1/2*h = 13 // : -1/2
h = 13/(-1/2)
h = -26
h = -26
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