Solve for x
x=0
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x\times 400-x\times 7200=0
Subtract x\times 7200 from both sides.
-6800x=0
Combine x\times 400 and -x\times 7200 to get -6800x.
x=0
Product of two numbers is equal to 0 if at least one of them is 0. Since -6800 is not equal to 0, x must be equal to 0.
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