Question

x-9 supra 6=x-8 supra 12​

Answer 1

$\huge \frac{x - 9}{6} = \frac{x - 8}{12} \\ \\ \huge 6(x - 8) = 12( x- 9) \\ \\ \huge6x - 48 = 12x - 108 \\ \\ \huge- 48 + 108 = 12x - 6x \\ \\ \huge60 = 6x \\ \\ \huge \: 6x = 60 \\ \\ \huge \: x = 60 \div 6 \\ \\ \huge x = 10$

Answer 2

$\it \dfrac{x-9}{6}=\dfrac{x-8}{12}|_{\cdot12} \Rightarrow 2x-18=x-8 \Rightarrow 2x-x=-8+18 \Rightarrow x=10$