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a) x+5
b) x-4
c) x•3
d) 7•2
49.
a) x•3 + 5= 20
b) 3x/5 + 3/2 = 1
c) x•5/100=20
d) 2x+2x=4x
50.
a) 9n+m
b) 17y-x-z
c) -a+13b-2ab