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How to send mathematical expressions quickly by SMS

It should be said that your formula is (1+x)+( 1+x)×x=90, which means that the first person sent X in the first round, and the first person sent X in the second round, but the topic only says that the person who got the information also sent a text message according to his sending number, so please repeat it.

Only 1+X+X*X=90 should be correct.