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f(5+2)= 8x-7
f= 8.-7-7
f= 49
f[x+2] = 8[x+2] - 7
f[x+2] = 8x + 16 - 7
f[x+2] = 8x + 9
f[5] = 8[5] + 9
f[5] = 40 + 9
f[5] = 49