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If the sum of 3th and 8th terms of an A.p is 7 and the sum of 7th and 14th term is -3,find the 10th term .

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term3 + term8 = 7
a+2d + a+7d = 7
2a + 9d = 7 **

term7 + term14 = -3
a+6d + a+13d = -3
2a + 19d = -3 ***

subtract ** from ***
10d =-10
d = -1

sub into *** to get a , then find a + 9d

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