Me ajuda MDS
A) X + X = 7
3 4
B) X + X = 1
3 5 2
C) 1 + x + 1 = X
2 3
D) X - X - 1 = 7
3 2 3
F) X + X = 12
5
G) X - X = -3
7
H) X + X = 21
5 2
I) 1 - X = -2× + 1
6 2 3 4
J) X - 8 - 4 = X
2
K) X - 2 = X - 4
8 3
L) 3 - X = X + 1 - 8
8 4 3