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There is a junior high school math problem solving equation, my equation is not very good, I still don't know how to solve it, and I didn't understand it in class.
First of all, your equation has only one unknown, and X has no second unknown.

The solution is simple.

1) Birds of a feather flock together. Put the unknown things together. Put these figures together. ..

x+3.5x = 45+5-5

(2) The same flow and pollution are combined with the same type.

4.5x = 45

Turn an enemy into a friend, and both sides score 4.5 points at the same time.

x = 10

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