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3x-6x+9=0
We simplify the equation to the form, which is simple to understand
3x-6x+9=0
We move all terms containing x to the left and all other terms to the right.
+3x-6x=0-9
We simplify left and right side of the equation.
-3x=-9
We divide both sides of the equation by -3 to get x.
x=3
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