8x - 6 = 4x + 30
solve for x
8x - 4x = 30 + 6
4x = 36
Divide both-side by 3
x = 9
XD= 8x - 6
substitute x = 9 in 8x - 6
XD = 8(9) - 6
=72 - 6
=66
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