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4x=42-10x
We move all terms to the left:
4x-(42-10x)=0
We add all the numbers together, and all the variables
4x-(-10x+42)=0
We get rid of parentheses
4x+10x-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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