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74=4x+10+2x+4
74=6x+14
74-14=6x
60=6x
10=x
panjang=2x+5
=2(10)+5
=25
lebar=x+2
=10+2
=12
selisihnya=25-12=13
<=> 4x+10+2x+4=74
<=> 4x+2x+10+4=74
<=> 6x=74-14
<=> 6x=60
<=> x=10
panjang= 2x+5 =2(10)+5 =20+5 =25
lebar = x+2 =(10)+2 =12
panjang - lebar = 25-12= 13