SUM OF TWO NUMBER IS 9 AND SUBTRATION OF 27 THEN ANSWARIS
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x-y=27
-(x+y=9)
_____
2y=18
y=9
substitute in x-y=27
x=27+y
x=27+9
x=36
-(x+y=9)
_____
2y=18
y=9
substitute in x-y=27
x=27+y
x=27+9
x=36
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