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