3h+12+2(h+9)=90

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Solution for 3h+12+2(h+9)=90 equation: 



3h+12+2(h+9)=90

We move all terms to the left:

3h+12+2(h+9)-(90)=0

We add all the numbers together, and all the variables

3h+2(h+9)-78=0

We multiply parentheses

3h+2h+18-78=0

We add all the numbers together, and all the variables

5h-60=0

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

5h=60

h=60/5

h=12

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