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64:4=3x+1
16 =3x+1
16-1=3x
15 =3x
15:3=x
5 =x
12. Keliling Persegi Panjangkan= 2xPanjang + 2xLebar
K=34
34=2(2x+3+x+2)
34:2=2x+3+x+2
17=2x+3+x+2
17-2-3=2x+x
12=3x
12:3=x
4=x