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a) 5 + 2x = 8
b) 3x + 2 = 8
c)5a + 9 = 19
d) 7n + 2 = 23
e) 8c + 2 = 10
2.5y=100
3.2x +2y=50
4.2y+y=300
5.10x+x=77