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21-4x=11+3x
We move all terms to the left:
21-4x-(11+3x)=0
We add all the numbers together, and all the variables
-4x-(3x+11)+21=0
We get rid of parentheses
-4x-3x-11+21=0
We add all the numbers together, and all the variables
-7x+10=0
We move all terms containing x to the left, all other terms to the right
-7x=-10
x=-10/-7
x=1+3/7
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