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Answer:
9
Step-by-step explanation:
[tex]x^{2}[/tex] - 36 = 5x
[tex]x^{2}[/tex] - 36 = 5x
[tex]x^{2}[/tex] -5x = 36
[tex]9^{2}[/tex] - 45 = 36
+ 45 + 45
-----------------------
81 = 81 ✅
[tex]9^{2}[/tex] - 36 = 5(9)
81 - 36 = 45 ✅