Solve the following equations for the unknown shown:
a. a + 13 = 20
b. 2x + 7 = 13
c. x + 20 = 9
d. 3a - 14 = 7
a. a + 13 = 20
b. 2x + 7 = 13
c. x + 20 = 9
d. 3a - 14 = 7
Mathematics
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