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a = 3 + 10
a = 13
-2 = 3xb + 10
-2 = 3b + 10
-12 = 3b
-4 = b
a + b = 13 + (-4) = 9
f(1) = 3.(1) + 10
a = 3 + 10
a = 13
f(b) = 3.(b) + 10
- 2 = 3b + 10
3b = - 2 - 10
3b = -12
b = - 12/3
b = - 4
maka : a + b = 13 + (- 4)
= 9