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kell = 4(2x-3)
28 = 8x-12
28+12 = 8x
40 = 8x
5 = x
28 cm =4 (2x-3)cm
28 cm =8x -12 cm
28 + 12 = 8x
40 = 8x
x = 40/8
=5
Jadi nilai x = 5