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4(5x/7)=42
We move all terms to the left:
4(5x/7)-(42)=0
We add all the numbers together, and all the variables
4(+5x/7)-42=0
We multiply parentheses
20x-42=0
We move all terms containing x to the left, all other terms to the right
20x=42
x=42/20
x=2+1/10
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