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3a + 15 = 30
3a= 30 -15
3a = 15
a = 15/ per 3
a = 5
2u - 9u = 8 + 6
-7u = 14
u = 14/-7
u = -2
4.) 3a + 15 = 6 x 5
3a + 15= 30
3a = 30 -15
3a = 15
a = 15/3
a = 5