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Determine which of the following pairs of straight lines are parallel. Do not draw the lines.
a) y=#1/2x+7#
#y=1/2x-20#

b) #3/2x+2/3y+3/2=0#
# 2/3x+3/2y+2/3=0#

c) 2x+3y-8=0
21-4x-6y=0