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4(5x-7) = 2(2x+3) + 2(2x+1)
20x - 28 = 4x + 6 + 4x + 2
20x-28=8x+8
12x=36
x=3
sisi persegi=8cm
panjang=9cm
lebar=7cm
9 panjang
7 lebar