Bonsoir,
A. - (4 + x)*3
= -( 12 +3x)
= -12-3x
B. 6- ( x + 2)
= 6-x -2
= 4-x
C.3,5 + (5 - y ) *2
= 3,5 +10 -2y
= 13,5 -2y
D. 2,6 - (3 + y) * ( -2)
= 2,6 +6 +2y
= 8,6 +2y
E. (- 7 + x ) * 3 + 4y * 2
= -21 +3x +8y
= 11y -21
F. (- x - (- y) + z - 2) * (-3)
= ( -x +y +z -2) *-3
= 3x -3y -3z +6