68=1/2h(8+9)

68=1/2h(8+9) expand the brackets to get

68=(1/2h*8)+(1/2h*9)

68=8/2h+9/2h

68=17/2h multiply both sides by 2 h to get

68*2h=17/2h*2h

136h=17 divide both sides by 136 to get

h=17/136

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