0
a + 0 = a
a - 0 = a
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Yes, they can.
No. When you subtract negative numbers, they have the same effect as if you added a positive number. In this scenario as described, the only result would be a positive number.
the answer is................................ -36/5.....................
Yes, the point is that if two terms (or sides of the equation) are equal, then they remain equal as long as you add or subtract the same amount, to or from both of them. It's very logical.
18-12 = 6 and 12/2 = 6