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450-30x+50x=490
We simplify the equation to the form, which is simple to understand
450-30x+50x=490
We move all terms containing x to the left and all other terms to the right.
-30x+50x=+490-450
We simplify left and right side of the equation.
+20x=+40
We divide both sides of the equation by 20 to get x.
x=2
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