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x+9 = 2. x+9= -2
x=2-9. x=-2-9
x=-7. x= 11
|5-x=7| atau
-x=7-5. 5-x=-7
-x=2. -x=-7-5
x=-2. -x=-12
x=-12
2 5-x=7
x=-2
5-(-2)=7
=5+2=7