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18x+7x=400+4x
We simplify the equation to the form, which is simple to understand
18x+7x=400+4x
We move all terms containing x to the left and all other terms to the right.
+18x+7x-4x=+400
We simplify left and right side of the equation.
+21x=+400
We divide both sides of the equation by 21 to get x.
x=19.0476190476
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