Répondre :
-3+a=7(2a-1)
- 3 + a = 14a -7
-14a +a = -7 +3
-13 a = -4
a = 4/13
-3 (2t+1)=-3(t-2)
-6t -3 = -3t +6
-6t +3t = 6+3
-3t = 9
t= -9/3
t = -3
- 3 + a = 14a -7
-14a +a = -7 +3
-13 a = -4
a = 4/13
-3 (2t+1)=-3(t-2)
-6t -3 = -3t +6
-6t +3t = 6+3
-3t = 9
t= -9/3
t = -3