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7x+21=4x+9
We simplify the equation to the form, which is simple to understand
7x+21=4x+9
We move all terms containing x to the left and all other terms to the right.
+7x-4x=+9-21
We simplify left and right side of the equation.
+3x=-12
We divide both sides of the equation by 3 to get x.
x=-4
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