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x in (-oo:+oo)
(3/11)*x-1 = (7/11)*a+9 // - (7/11)*a+9
(3/11)*x-((7/11)*a)-9-1 = 0
(-7/11)*a+(3/11)*x-9-1 = 0
3/11*x-7/11*a-10 = 0 // + -7/11*a-10
3/11*x = -(-7/11*a-10) // : 3/11
x = (-(-7/11*a-10))/3/11
x = 11/3*(10-(-7/11*a))
x = 11/3*(10-(-7/11*a))
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