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3(4+5x)=42
We move all terms to the left:
3(4+5x)-(42)=0
We add all the numbers together, and all the variables
3(5x+4)-42=0
We multiply parentheses
15x+12-42=0
We add all the numbers together, and all the variables
15x-30=0
We move all terms containing x to the left, all other terms to the right
15x=30
x=30/15
x=2
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