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f(c)=7
f(c)=2c-5=7
2c=7+5
c=12/2
c=6
Semoga membantu, ^^
f(c)= 2c - 5= 7
2c= 7 + 5
2c= 12
c= 12/2
c= 6
Jadi, nilai c adalah 6.