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210x+120=490x+504
We simplify the equation to the form, which is simple to understand
210x+120=490x+504
We move all terms containing x to the left and all other terms to the right.
+210x-490x=+504-120
We simplify left and right side of the equation.
-280x=+384
We divide both sides of the equation by -280 to get x.
x=-1.37142857143
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