If 11 + X = 77, X = 66. What you have to do is 77 - 66, and that = 11!
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7x10=77 7 x 11 = 77
77
x equals 8
x + 6
5x + 33 = 15x - 77 Subtract 5 x from both sides: 33 = 10x - 77 Add 77 to both sides: 110 = 10x Divide both sides by 10: 11 = x