The problem is done like this: x+5=12 subtract five from the left side and the right side, because you have to always do the same thing to both sides
x+5-5=12-5
x=7
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7
-5x + 13 = -12 -5x = -12 - 13 = -25 x = -25/-5 = 5
(8 + 4) x 5...
5+x=x+5 is an example of the commutative property of addition.
If: 2x = x+5 Then: x = 5