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x in (-oo:+oo)
1/2-((3*x)/5) = 11/2 // - 11/2
1/2-((3*x)/5)-(11/2) = 0
(-3/5)*x+1/2-11/2 = 0
-3/5*x-5 = 0 // + 5
-3/5*x = 5 // : -3/5
x = 5/(-3/5)
x = -25/3
x = -25/3
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