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f(-1) => 3(-1) +10 = a
=> -3 +10 = a
=> 7 = a
f(b) => 3(b) + 10 = -2
=> 3b + 10 = -2
=> 3b = - 2 - 10
=> 3b = - 12 (masing masing ruas dibagi 3)
=> b = -4
jadi a+b => 7 + (-4)
=> 3
jadi jawabannya adalah a