10x - (- 11x - ( - 3x)) + 9 = 81
10x - (- 11x + 3x) + 9 = 81
10x - (- 8x) + 9 = 81
10x + 8x + 9 = 81
18x = 72
x = 4
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10x - (- 11x - ( - 3x)) + 9 = 81
10x - (- 11x + 3x) + 9 = 81
10x - (- 8x) + 9 = 81
10x + 8x + 9 = 81
18x = 72
x = 4