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StartFraction 2 a Over h EndFraction minus b 2 equals b 1.
StartFraction a Over 2 h EndFraction minus b 2 equals b 1.
StartFraction 2 a minus b 2 Over h EndFraction equals b.
StartFraction a Over 2 left-parenthesis b 1 plus b 1 right-parenthesis EndFraction equals h.