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21-2(x-3)=48-4(3-x)-7x
We simplify the equation to the form, which is simple to understand
21-2(x-3)=48-4(3-x)-7x
Reorder the terms in parentheses
21+(-2x+6)=48-4*(3-x)-7x
Remove unnecessary parentheses
+21-2x+6=+48-4+*(+3-x+)-7x
Reorder the terms in parentheses
21-2x+6=48+(-12+4x)-7x
Remove unnecessary parentheses
+21-2x+6=+48-12+4x-7x
We move all terms containing x to the left and all other terms to the right.
-2x-4x+7x=+48-12-21-6
We simplify left and right side of the equation.
+1x=+9
We divide both sides of the equation by 1 to get x.
x=9
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