420 ÷ 336 = (90-x) ÷ (x-4) Carilah hasil dari x!

[tex] \frac{420}{336} = \frac{(90 - x)}{(x - 4)} \\ 420(x - 4) = 336(90 - x) \\ 420x - 1680 = 30240 - 336x \\ 420x + 336x = 30240 + 1680 \\ 756x = 31920 \\ x = \frac{31920}{756} = 42.22[/tex]
maaf ya klo salah