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4x=28/;4
1x=7
b)3x+39=57/-39
3x=18/;3
1x=6
c)7a+20=6a+39/-20
7a=6a+19/-6a
1a=19
d) 13z+15=z+63/-1z
12z+15=63/-15
12=48/:12
1z=4