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f(a)= 3a-5
10 = 3a - 5
3a = 15
a = 15/3
a=5
f(x) = 3x-5 = 10
= 3x = 10 + 5
3x = 15
x = 5
untuk membeuktikan nilai a = x
masukan nilai x ke
f(x) = 3x-5
= 3 (5) - 5
= 10
Terbukti nilai a = 5
Semoga membantu :) D