Three times the sum of x and 7 exceeds y by 23?

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see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

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13 - r - 1 + r

= 12 - r

c

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= - 8 - r + 2r - 4

= - 12 + r

d

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= 7r - - - 6r

[-   - = - - = - ]

= r -