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3(a+2b) = a + 4b
2a + 2b = 0
a + b = 0
a = - b
S4 = 16
4 (a + U4) = 16
a + 3b = 4
-b + 3b =4
b = 2
a = - b ---> a = -2
S10 = 10/2 ( 2a + 9b)= 5(-4 +18)= 70