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x in (-oo:+oo)
(3*(5*x-9))/8-n = 0
(3*(5*x-9))/8+(8*(-n))/8 = 0
3*(5*x-9)+8*(-n) = 0
15*x-8*n-27 = 0
(15*x-8*n-27)/8 = 0
(15*x-8*n-27)/8 = 0 // * 8
15*x-8*n-27 = 0
15*x-8*n-27 = 0 // + -8*n-27
15*x = -(-8*n-27) // : 15
x = (-(-8*n-27))/15
x = (27-(-8*n))/15
x = (27-(-8*n))/15
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