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(100x+200x)=1200
We simplify the equation to the form, which is simple to understand
(100x+200x)=1200
Remove unnecessary parentheses
+300x=1200
We move all terms containing x to the left and all other terms to the right.
+300x=+1200
We simplify left and right side of the equation.
+300x=+1200
We divide both sides of the equation by 300 to get x.
x=4
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