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h in (-oo:+oo)
h = (5*h)/7+18 // - (5*h)/7+18
h-((5*h)/7)-18 = 0
h+(-5/7)*h-18 = 0
2/7*h-18 = 0 // + 18
2/7*h = 18 // : 2/7
h = 18/2/7
h = 63
h = 63
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