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Answer :

Answer:

49

Step-by-step explanation:

6u+42=8(u-7)

6u+42=8u-56

-6u       -6u

-----------------

42=2u-56

+56       +56

---------------------

98=2u

----------

2

49=u

u=1
6u+42=-8u+56
6u=-8u+56-42
6u=-8u+14
6u+8u=14
14u=14
u=1