42=3(9+x)

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Solution for 42=3(9+x) equation:



42=3(9+x)
We move all terms to the left:
42-(3(9+x))=0
We add all the numbers together, and all the variables
-(3(x+9))+42=0
We calculate terms in parentheses: -(3(x+9)), so:
3(x+9)
We multiply parentheses
3x+27
Back to the equation:
-(3x+27)
We get rid of parentheses
-3x-27+42=0
We add all the numbers together, and all the variables
-3x+15=0
We move all terms containing x to the left, all other terms to the right
-3x=-15
x=-15/-3
x=+5

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