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2x+5x=400
We simplify the equation to the form, which is simple to understand
2x+5x=400
We move all terms containing x to the left and all other terms to the right.
+2x+5x=+400
We simplify left and right side of the equation.
+7x=+400
We divide both sides of the equation by 7 to get x.
x=57.142857142857
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