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135+151+62+140+h+(h+6)=720
We move all terms to the left:
135+151+62+140+h+(h+6)-(720)=0
We add all the numbers together, and all the variables
h+(h+6)-232=0
We get rid of parentheses
h+h+6-232=0
We add all the numbers together, and all the variables
2h-226=0
We move all terms containing h to the left, all other terms to the right
2h=226
h=226/2
h=113
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