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a in (-oo:+oo)
(1/5)*a+5*a-7 = -211/45 // + -211/45
(1/5)*a+5*a-(-211/45)-7 = 0
(1/5)*a+5*a+211/45-7 = 0
26/5*a-104/45 = 0 // + 104/45
26/5*a = 104/45 // : 26/5
a = 104/45/26/5
a = 4/9
a = 4/9
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