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x in (-oo:+oo)
((3*a)/7)*x-(2*a) = 11 // - 11
((3*a)/7)*x-(2*a)-11 = 0
((3*a)/7)*x-2*a-11 = 0
3/7*a*x-2*a-11 = 0 // + -2*a-11
3/7*a*x = -(-2*a-11) // : 3/7*a
x = (-(-2*a-11))/(3/7*a)
x = 7/3*a^-1*(11-(-2*a))
x = 7/3*a^-1*(11-(-2*a))
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