Question

X- 3= 3 (7-X)
2


Como resolvo ?

Answer 1

$\underline{você\:quis\:dizer:}\\\dfrac{x-3}{2}=3(7-x)$

$x - 3 = 6(7 - x) \\ x - 3 = 42 - 6x \\ x + 6x = 42 + 3 \\ 7x = 45$

$\bf{x = \frac{45}{7} }$