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h in (-oo:+oo)
4*h-(8/(-2)) = 12 // - 12
4*h-(8/(-2))-12 = 0
4*h-12+4 = 0
4*h-8 = 0 // + 8
4*h = 8 // : 4
h = 8/4
h = 2
h = 2
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