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a in (-oo:+oo)
18-((2/11)*a) = (5/11)*a-19 // - (5/11)*a-19
18-((2/11)*a)-((5/11)*a)+19 = 0
(-2/11)*a+(-5/11)*a+18+19 = 0
37-7/11*a = 0 // - 37
-7/11*a = -37 // : -7/11
a = -37/(-7/11)
a = 407/7
a = 407/7
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