Math/Solving side lengths of similar figures!!!

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I have to find out what (x) equals. it shows me two triangles. ABC and XYZ. XYZ's sides are X-6 Y-10 and Z-8. ABC's sides are A-(x) B-25 and nothing for C. i need to find the value of (x). I'm expelled from school, and I get taught at the library everyday by my tutor so I can pass 7th grade. Today is the first day we started working on this kind of stuff. And i totally forgot how to do it, I looked allover the internet for help, but I couldn't find any. And it's harder now for me kinda because i don't have my teacher to explain everything, she goes through it so quickly. and sher has my practice papers so idk what to do. please help!!!(:

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