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f(-1) = 3(-1)+10
a = -3+10
a = 7
f(b) = 3(b) + 10
-2 = 3b + 10
-12 = 3b
b = -4
a+b = 7+(-4)
= 3
= -3+ 10 = 7
maka a = 7
2 = 3(b) + 10
3b = 10 +2
3b = 12
b = 12/3 = 4
maka a+b = 7 +4=11