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= 2x (2x-6+x+8)
=2x (3x+2)
=6x+4
28=6x+4
6x=24
x=4
luas = pxl
= 2(4)-6×(4)+8
=2x12
=24
maka
28 = 2(2x-6) + 2(x+8)
28=4x-12+2x+16
28=6x+4
6x=28-4
x=24/6
x=4
maka
p=(2(4)-6=2
l=4+8=12
maka
luas= p.l
luas =2x12
=24