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4(sisi) = 2( panjang) + 2 ( lebar)
4(x+3) = 2(2x-3)+ 2(x+1)
4x+12. = 4x-6 + 2x+2
4x-4x-2x= -6+2-12
-2x. = -16
x. = -16/-2
x. = 8