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This is not possible to "solve" as such. 3x + 4x = 7x, which is the same as 7x=7x. Clearly, you end up with x=x, which is true, but not useful.

This suggests that you have used the wrong method when trying to solve the problem, however your algebra was correct, since x does indeed equal x; it's when you end up with something like 2=1, or 1=0, that you have to worry.

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13y ago

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Q: How do you solve 3x 4x equals 7x?
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