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42x=221x-4
We move all terms to the left:
42x-(221x-4)=0
We get rid of parentheses
42x-221x+4=0
We add all the numbers together, and all the variables
-179x+4=0
We move all terms containing x to the left, all other terms to the right
-179x=-4
x=-4/-179
x=4/179
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