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21(x+1)-14(x-1)=12x
We simplify the equation to the form, which is simple to understand
21(x+1)-14(x-1)=12x
Reorder the terms in parentheses
+(+21x+21)-14*(x-1)=12x
Remove unnecessary parentheses
+21x+21-14+*(+x-1+)=+12x
Reorder the terms in parentheses
+21x+21+(-14x+14)=12x
Remove unnecessary parentheses
+21x+21-14x+14=+12x
We move all terms containing x to the left and all other terms to the right.
+21x-14x-12x=-21-14
We simplify left and right side of the equation.
-5x=-35
We divide both sides of the equation by -5 to get x.
x=7
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