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4x + 12 = 4x - 6 + 2x +2
4x + 12 = 6x -4
4x -6x = -4 -12
-2x = -16
x = -16/-2
x = 8
panjang sisi persegi = (x +3) = 8 + 3 = 11
4x+12cm = 4x-6cm +2x+2 cm
4x-4x-2x = -6cm +2cm -12 cm
-2x = -16 cm
-x = -8 cm
x=8cm.
panjang sisi persegi tsb = (x+3)cm.
= 8cm +3 cm
= 11cm
smoga bermanfaat