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21+2x=3+5x
We move all terms to the left:
21+2x-(3+5x)=0
We add all the numbers together, and all the variables
2x-(5x+3)+21=0
We get rid of parentheses
2x-5x-3+21=0
We add all the numbers together, and all the variables
-3x+18=0
We move all terms containing x to the left, all other terms to the right
-3x=-18
x=-18/-3
x=+6
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