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= 96 cm2
36x + 12 = 96 x 2
36x + 12 = 192
36x = 192 - 12
36x = 180
x = 5
96 = 1/2 x (3x+1) x 12
96 = 6 x ( 3x + 1 )
( 3x + 1 ) = 16
3x = 15
x = 5