pouvez vous m'aider svp :-/

A
x+3(x-2/3)=x-10
x+3x-2=x-10
4x-2=x-10
3x=-8 ==> x=-8/3
B
4x-10(2x-3/5)+2x-7=0
4x-20x+6+2x-7=0
-14x-1=0 ==> x=-1/14
C
1/2x+3/4=-7/2(1/5x+2/3)
1/2x+3/4=-7/10x-14/6
1/2x+7/10x=-3/4-14/6
12/10x=-9/12-28/12
12/10x=-37/12