[tex] N°⇒x = 9 \\ 2x + 7 = 25 \\ 2x = 25 - 7 \\ 2x = 18 \\ x = 9 [/tex]
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[tex] N°⇒x = 9 \\ 2x + 7 = 25 \\ 2x = 25 - 7 \\ 2x = 18 \\ x = 9 [/tex]