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2nd no. is explanation:

x - y =18

x + y=86

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2x = 104

x = 52

we know, x + y = 86 (sub. x value in the equ.)

52 + y = 86

y = 86 - 52

y = 34

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Then,

Thus,

⇒x-86+x=18

⇒2x-86=18

⇒2x=86+18

⇒2x=104

Therefore,