[tex]9(2+x)=10(7+x)[/tex]
Use distributive property: a(b + c) = ab + ac
[tex](9)(2)+(9)(x)=(10)(7)+(10)(x)\\\\18+9x=70+10x\ \ \ \ |-18\\\\9x=52+10x\ \ \ \ |-10x\\\\-x=52\to x=-52[/tex]
Answer: -52 In a fraction? OK: [tex]-\dfrac{52}{1},\ -\dfrac{104}{2},\ -\dfrac{156}{3},\ ...[/tex]
