Bonsoir
( 3 - x ) / ( x + 2 ) = 3
3 x + 6 = 3 - x
3 x + x = 3 - 6
4 x = - 3
x = - 3/4
( x - 8 )² - 16 / ( x - 4 ) = 0
( x - 8 - 4 ) ( x - 8 + 4 ) / ( x - 4 ) = 0
( x - 12 ) ( x - 4 ) / ( x - 4 ) = 0
x - 12 = 0
x = 12
2 x / ( x + 1 ) = ( 2 x + 1 ) / x
2 x² + 2 x + x + 1 = 2 x²
2 x² - 2 x² + 3 x = - 1
3 x = - 1
x = - 1/3