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9x=42-5x
We move all terms to the left:
9x-(42-5x)=0
We add all the numbers together, and all the variables
9x-(-5x+42)=0
We get rid of parentheses
9x+5x-42=0
We add all the numbers together, and all the variables
14x-42=0
We move all terms containing x to the left, all other terms to the right
14x=42
x=42/14
x=3
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