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35 = 7x + 14
7x = 35 - 14
7x = 21
x = 3
Panjang :
( 5x + 9 ) cm = ( 15 + 9 ) cm = 24 cm
Lebar :
( 2x + 5 ) cm = ( 6 + 5 ) cm = 11 cm
70=2((5x+9)+(2x+5))
70÷2=7x+14
35=7x+14(pindah ke ruas kiri)
35-14=7x
21=7x
x=21÷7
x=3
panjang= 5*3+9=24
lebar= 2*3+5= 11