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42=3(2-3)h
We move all terms to the left:
42-(3(2-3)h)=0
We add all the numbers together, and all the variables
-(3(-1)h)+42=0
We calculate terms in parentheses: -(3(-1)h), so:We get rid of parentheses
3(-1)h
We multiply parentheses
-3h
Back to the equation:
-(-3h)
3h+42=0
We move all terms containing h to the left, all other terms to the right
3h=-42
h=-42/3
h=-14
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