X+6≠x, unless X ≠ x.
small x minus 6 would be equal to big X.
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The calculation should only have two steps.
30 = d/6.5
195 = d
8x-77 would be the answer to this
Let n represent the number. You require
7n - 2n = 55
5n = 55 . . . . . . collect terms
n = 11 . . . . . . . divide by 5
The number is 11.
