Sagot :
a)-2x+6=27
-2x=27-6
-2x=21
x=21/-2
x=-10,5
b)9-4a=7
-4a=-9+7
-4a=-2
a=-2/-4
a=0,5
c)6t-4=3t+14
6t-3t=4+14
3t=18
t=18/3
t=6
d)9-2a=11+4a
9-11=2a+4a
-2=6a
a=-2/6
e)2t+3=10-5t
2t+5t=10-3
7t=7
Voilà
-2x=27-6
-2x=21
x=21/-2
x=-10,5
b)9-4a=7
-4a=-9+7
-4a=-2
a=-2/-4
a=0,5
c)6t-4=3t+14
6t-3t=4+14
3t=18
t=18/3
t=6
d)9-2a=11+4a
9-11=2a+4a
-2=6a
a=-2/6
e)2t+3=10-5t
2t+5t=10-3
7t=7
Voilà