Jangkauan:
a - b = 28
Jika ditambah 3
(a + 3) - (b + 3) = 28
a + 3 - b - 3 = 28
a + 0 - b = 28
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Jangkauan:
a - b = 28
Jika ditambah 3
(a + 3) - (b + 3) = 28
a + 3 - b - 3 = 28
a + 0 - b = 28
a - b = 28