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2x = 9+9 = 18
x = 18/2
x = 9
b) y+23 = 23
y = 23-23
y= 0
c) -3z = 27
z = - 27/3
z = -9
d) 2y-18 = -12
2y= -12+18 = 6
y = 6/2
y=3
e) 5t+9 = -6
5t = -6-9 = -15
t = -15/5
t = -3
f) 2(x+2) = 5
2x+4 = 5
2x = 5-4 = 1
x = 1/2