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-7x=21 / :-7
x=3
b) 7y - 8 = -y + 24
8y=32 /:8
y=4
c) -8z + 5 = -z - 1
-7z=-6 /: -7
z=-6/7
d) -2m + 7 = m - 6
-3m=-13 /:-3
m = 13/3
e) 6 - 5x = 2x - 7
-7x=-13 :/-7
x=13/7
f) -5t + 1 = 8 - 6t
t=7