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9-2x+4x=0
We simplify the equation to the form, which is simple to understand
9-2x+4x=0
We move all terms containing x to the left and all other terms to the right.
-2x+4x=0-9
We simplify left and right side of the equation.
+2x=-9
We divide both sides of the equation by 2 to get x.
x=-4.5
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