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68=2(4x+1)+2(3x-2)
68=8x+2+6x-4
68=14x-2
68+2=14x
70=14x
x= 5
panjang = 4x+1=4(5)+1=21
lebar= 3x-2=3(5)-2=13
luas
p×l
21×13=273 cm²