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=2x+8-5 =3x-6+5
=2(4)+8-5=3(4)-6+5
=8+8-5 =12-6+5
=16-5 =6+5
=11 =11
Jadi, x = 4 sehingga nilai dari x-1 = 4-1= 3
Jawaban = b. 3