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-6t = 2
t= - 2/6
b) 2w + 3 = 4w - 5
- 2w = -8
w = 4
c) 3x - 1 = 5x
- 1 = 2x
x = - 1/2
d) y - 3 = 9 - y
2y = 12
y = 6
e) 0,5z + 6 = z - 1
0,5 z = - 7
z = - 14