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x + 15 + x + 3 = 48
2x + 18 = 48
2x = 48 - 18
2x = 30
x = 15
caranya..
=> sisi AB + sisi CD = 48
=> (x+15) + (x+3) = 48
=> x + 15 + x + 3 = 48
=> 2x + 18 = 48
=> 2x = 48 - 18
=> 2x = 30
=> x = 30 : 2
=> x = 15
jadi nilai x adalah 15