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3(21-7x)=-42
We simplify the equation to the form, which is simple to understand
3(21-7x)=-42
Reorder the terms in parentheses
+(+63-21x)=-42
Remove unnecessary parentheses
+63-21x=-42
We move all terms containing x to the left and all other terms to the right.
-21x=-42-63
We simplify left and right side of the equation.
-21x=-105
We divide both sides of the equation by -21 to get x.
x=5
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