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14(x)+31=21(x)+10
We move all terms to the left:
14(x)+31-(21(x)+10)=0
We get rid of parentheses
14x-21x-10+31=0
We add all the numbers together, and all the variables
-7x+21=0
We move all terms containing x to the left, all other terms to the right
-7x=-21
x=-21/-7
x=+3
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