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