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x - 4 = 12 + 2 2/5
x = 12 + 4 + 2 2 /5
x = 18 2/5
jika x = a
maka
a + 4 =18 2/5 + 4
= 22 2/5
x - 4 = 14 2/5
x = 18 2/5
x= a
a+4 = 18 2/5 + 4
= 22 2/5