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168x=20x+21x+4
We move all terms to the left:
168x-(20x+21x+4)=0
We add all the numbers together, and all the variables
168x-(41x+4)=0
We get rid of parentheses
168x-41x-4=0
We add all the numbers together, and all the variables
127x-4=0
We move all terms containing x to the left, all other terms to the right
127x=4
x=4/127
x=4/127
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