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2 (3x+7) + 2(2x+5)
6x +14 + 4x +10 =54
10x + 24 = 54
10x = 54-24
10x = 30
x=3
jadi panjang p.pnjng adlh (3(3)+7)=16
lebar (2(3)+5)=11 jawaban C
6x+14+4 x+10=54
10x+24=54
10x=54-24
10x=30
x=30/10=3
3x+7=3*3+7=16
2x+5=2*3+5=11
jawabannya c