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3x-(6x+9)=8x-42
We simplify the equation to the form, which is simple to understand
3x-(6x+9)=8x-42
Remove unnecessary parentheses
3x-6x-9=8x-42
We move all terms containing x to the left and all other terms to the right.
+3x-6x-8x=-42+9
We simplify left and right side of the equation.
-11x=-33
We divide both sides of the equation by -11 to get x.
x=3
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