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4(x+1) = 2(2x-3)+ 2(x+1)
4x + 4 = 4x-6 + 2x + 2
4x + 4 = 6x -4
4x-6x = -4 -4
-2x =-8
x = 4
sisi persegi = x+1
= 4 + 1
= 5 cm