Equations à résoudre : (voir image ci-dessus) ⬇️⬇️

a + 3 = 1
a = 1-3
a = - 2

t - 6 = - 2
t = - 2 + 6
t = 4

2p + 5 = 7
2p = 7 - 5
2p = 2
p = 2/2
p = 1

3x - 2 = 6
3x = 6 + 2
3x = 8
x = 8/3  

-4u + 9 = -1    
-4u  = - 1 - 9
-4u = - 10
u =10/4
u = 5/2

2x - 4 = x + 3
2x - x = 3 + 4
x = 7