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x in (-oo:+oo)
x = (1/15)*a // - (1/15)*a
x-((1/15)*a) = 0
(-1/15)*a+x = 0
x-1/15*a = 0 // + -1/15*a
x = -(-1/15*a)
x = 1/15*a
x = 1/15*a
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