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21x+8=50x-11
We move all terms to the left:
21x+8-(50x-11)=0
We get rid of parentheses
21x-50x+11+8=0
We add all the numbers together, and all the variables
-29x+19=0
We move all terms containing x to the left, all other terms to the right
-29x=-19
x=-19/-29
x=19/29
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