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63x+126-63x=2x+4x
We move all terms to the left:
63x+126-63x-(2x+4x)=0
We add all the numbers together, and all the variables
63x-63x-(+6x)+126=0
We add all the numbers together, and all the variables
-(+6x)+126=0
We get rid of parentheses
-6x+126=0
We move all terms containing x to the left, all other terms to the right
-6x=-126
x=-126/-6
x=+21
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