X+3=5 Is the same as 2+3=5. One way to look at it is to subtract the number from te answer. So, 3-5 equals 2. 2=X.
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you do 3 plus 5 first then you get 8 you have to find out what minus 7 equals 8
7
y=5
2
n + 2 = 5, solve for n.n = 5 - 2n = 3