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-21x-3(2-3x)=6(x-4)-21
We simplify the equation to the form, which is simple to understand
-21x-3(2-3x)=6(x-4)-21
Reorder the terms in parentheses
-21x+(-6+9x)=6*(x-4)-21
Remove unnecessary parentheses
-21x-6+9x=+6+*(+x-4+)-21
Reorder the terms in parentheses
-21x-6+9x=+(+6x-24)-21
Remove unnecessary parentheses
-21x-6+9x=+6x-24-21
We move all terms containing x to the left and all other terms to the right.
-21x+9x-6x=-24-21+6
We simplify left and right side of the equation.
-18x=-39
We divide both sides of the equation by -18 to get x.
x=2.16666666667
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