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12x+21=5x+224
We move all terms to the left:
12x+21-(5x+224)=0
We get rid of parentheses
12x-5x-224+21=0
We add all the numbers together, and all the variables
7x-203=0
We move all terms containing x to the left, all other terms to the right
7x=203
x=203/7
x=29
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