7h-13=3h-21

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Solution for 7h-13=3h-21 equation: 



7h-13=3h-21

We move all terms to the left:

7h-13-(3h-21)=0

We get rid of parentheses

7h-3h+21-13=0

We add all the numbers together, and all the variables

4h+8=0

We move all terms containing h to the left, all other terms to the right

4h=-8

h=-8/4

h=-2

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