Here's the original equation:
x+8 =5
subtract 8 from both sides:
x + 8 - 8 = 5 - 8
left side: x + 8 - 8 = x
right side: 5 - 8 = -3
put them together:
x = -3
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Yes, -8 plus plus 3 equals -5. The "plus plus" is equivalent to a positive sign, so -8 plus (+3) equals -5.
89
5
8 + 5 + 4 = 17
A = 77 + 5 + 8 = 20