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40=12x+21
We move all terms to the left:
40-(12x+21)=0
We get rid of parentheses
-12x-21+40=0
We add all the numbers together, and all the variables
-12x+19=0
We move all terms containing x to the left, all other terms to the right
-12x=-19
x=-19/-12
x=1+7/12
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