Sagot :
A:-7x-2x=3-15
-9x=-12
x=-12/-9
x=4/3
B:6x-7x=3+10
-1x=13
x=13/-1
x=-13
C:4t+10t=4+3
14t=7
t=7/14
t=1/2
D:y+1=-3y+4
y+3y=4-1
4y=3
y=3/4
A:-7x-2x=3-15
-9x=-12
x=-12/-9
x=4/3
B:6x-7x=3+10
-1x=13
x=13/-1
x=-13
C:4t+10t=4+3
14t=7
t=7/14
t=1/2
D:y+1=-3y+4
y+3y=4-1
4y=3
y=3/4