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3(-7x-1)-(4-5x)=57
We simplify the equation to the form, which is simple to understand
3(-7x-1)-(4-5x)=57
Reorder the terms in parentheses
+(-21x-3)-(4-5x)=57
Remove unnecessary parentheses
-21x-3-(+4-5x+)=+57
Remove unnecessary parentheses
-21x-3-4+5x=57
We move all terms containing x to the left and all other terms to the right.
-21x+5x=+57+3+4
We simplify left and right side of the equation.
-16x=+64
We divide both sides of the equation by -16 to get x.
x=-4
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