30+90=4h

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Solution for 30+90=4h equation: 



30+90=4h

We move all terms to the left:

30+90-(4h)=0

We add all the numbers together, and all the variables

-4h+120=0

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

-4h=-120

h=-120/-4

h=+30

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