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4x+21=2x+9
We simplify the equation to the form, which is simple to understand
4x+21=2x+9
We move all terms containing x to the left and all other terms to the right.
+4x-2x=+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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