Bonjour,
3y - 5 = 1
3y = 6
y = 6/3
y = 2
2a - 7 = 5 - 4a
2a = 12 - 4a
6a = 12
a = 12/6
a = 2
5t + 2 = 7t
2 = 2t
t = 2/2
t = 1
2(3-a) = 5a - 8
6 - 2a = 5a - 8
6 = 7a - 8
14 = 7a
a = 14/7
x + 1 = 2x - 1
1 = x - 1
x = 2
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Bonjour,
3y - 5 = 1
3y = 6
y = 6/3
y = 2
2a - 7 = 5 - 4a
2a = 12 - 4a
6a = 12
a = 12/6
a = 2
5t + 2 = 7t
2 = 2t
t = 2/2
t = 1
2(3-a) = 5a - 8
6 - 2a = 5a - 8
6 = 7a - 8
14 = 7a
a = 14/7
a = 2
x + 1 = 2x - 1
1 = x - 1
x = 2