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K =s+s+s
19 = (2x-1)+(x+3)+(3x-1)
19 = 2x+x+3x-1+3-1
19 = 6x+1
18 = 6x
x = 3
jadi, nilai x adalah 3
semoga membantu.. :)
19 = (2x - 1) + (x + 3) + (3x - 1)
19 = 6x + 1
6x = 19 - 1
6x = 18
x = 18/6 = 3 cm