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a in (-oo:+oo)
-7 = (1/5)*a // - (1/5)*a
-((1/5)*a)-7 = 0
(-1/5)*a-7 = 0
-1/5*a-7 = 0 // + 7
-1/5*a = 7 // : -1/5
a = 7/(-1/5)
a = -35
a = -35
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