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1x=7x+42x
We move all terms to the left:
1x-(7x+42x)=0
We add all the numbers together, and all the variables
1x-(+49x)=0
We add all the numbers together, and all the variables
x-(+49x)=0
We get rid of parentheses
x-49x=0
We add all the numbers together, and all the variables
-48x=0
x=0/-48
x=0
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