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7x+10=21x-4
We move all terms to the left:
7x+10-(21x-4)=0
We get rid of parentheses
7x-21x+4+10=0
We add all the numbers together, and all the variables
-14x+14=0
We move all terms containing x to the left, all other terms to the right
-14x=-14
x=-14/-14
x=1
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