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9-7x=84-28x
We simplify the equation to the form, which is simple to understand
9-7x=84-28x
We move all terms containing x to the left and all other terms to the right.
-7x+28x=+84-9
We simplify left and right side of the equation.
+21x=+75
We divide both sides of the equation by 21 to get x.
x=3.57142857143
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