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a in (-oo:+oo)
6-3*a = (1/6)*a+25 // - (1/6)*a+25
6-3*a-((1/6)*a)-25 = 0
(-1/6)*a-3*a-25+6 = 0
-19/6*a-19 = 0 // + 19
-19/6*a = 19 // : -19/6
a = 19/(-19/6)
a = -6
a = -6
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