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½ x + ⅔x -x = -2⅔
³/₆ x+⁴/₆ x- ⁶/₆ x= -2⅔
⁷/₆x- ⁶/₆ x= -2⅔
¹/₆x = -2⅔ / *6
x = -⁸/₃ * 6
x = -16
2(n-6)+ 13= n-3+27
2n-12+13 = n-3+27
2n-n = -3+27+12-13
n=23