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0=21x+49
We move all terms to the left:
0-(21x+49)=0
We add all the numbers together, and all the variables
-(21x+49)=0
We get rid of parentheses
-21x-49=0
We move all terms containing x to the left, all other terms to the right
-21x=49
x=49/-21
x=-2+1/3
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