8x + 9 + 6 = 126
8x + 15 = 126
8x = 126 - 15
8x = 111
x = 111/8
x = 13.875
Check:
8(13.875) + 9 + 6 = 126
111 + 15 = 126
126 = 126
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Commutative property of addition.
Minus 8 plus 6 equals -2.