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4h+(-10h)+21=-15
We move all terms to the left:
4h+(-10h)+21-(-15)=0
We add all the numbers together, and all the variables
4h+(-10h)+36=0
We get rid of parentheses
4h-10h+36=0
We add all the numbers together, and all the variables
-6h+36=0
We move all terms containing h to the left, all other terms to the right
-6h=-36
h=-36/-6
h=+6
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