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Hi,
Twice the sum of a number
and 9
is equal to three times the difference of the number
and 6.
*** 2x + 9 = 3(x-6)
2x + 9 = 3x-18
27 = x
CHECKING our answer***
2•27 + 9 = 63 = 3•21
Wish You the Best in your Studies.