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Answer:
Let the numbers be x and y
X + Y =15
X -Y = 7
Make X subject of formula in equation 1
X = 15-Y
Substitute for X in equation 2
15 -Y -Y = 7
15 - 2Y = 7
15 - 7 = 2Y
8 = 2Y
Divide both sides by 2
Y = 4
Substitute for Y in equation 3
X=15 -Y
X=15-4
X=11
Therefore the numbers are 11 and 4
Step-by-step explanation:
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