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10=4x+21
We move all terms to the left:
10-(4x+21)=0
We get rid of parentheses
-4x-21+10=0
We add all the numbers together, and all the variables
-4x-11=0
We move all terms containing x to the left, all other terms to the right
-4x=11
x=11/-4
x=-2+3/4
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