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-5x-7(7x-3)=21
We simplify the equation to the form, which is simple to understand
-5x-7(7x-3)=21
Reorder the terms in parentheses
-5x+(-49x+21)=21
Remove unnecessary parentheses
-5x-49x+21=+21
We move all terms containing x to the left and all other terms to the right.
-5x-49x=+21-21
We simplify left and right side of the equation.
-54x=0
We divide both sides of the equation by -54 to get x.
x=-0
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