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21-4x=-6x+9
We simplify the equation to the form, which is simple to understand
21-4x=-6x+9
We move all terms containing x to the left and all other terms to the right.
-4x+6x=+9-21
We simplify left and right side of the equation.
+2x=-12
We divide both sides of the equation by 2 to get x.
x=-6
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