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2014-05-23T10:33:13+08:00

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You just need to isolate similar terms.

x + 13 = 15

x = 15 -13 

x = 2
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2014-05-23T16:21:06+08:00

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You just have to isolate x. In order to do that, you need to transpose 13 to the right side. 

X+13 = 15
x=15-13 (sign changes when you transpose)
x=2--> Final answer
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