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=6x-4+4x+2
=10x-2
38+2=10x
40=10x
4=x
panjang =3(4)-2
=10
lebar = 2(4)+1
= 9
luas=10x9
90cm²
5x-1=19
x=20/5
x= 4
panjang (3.4-2)=12-2=10
lebar(2.4+1)=8+1=9
luas=pxl=10x9=90