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x in (-oo:+oo)
x/3 = 81*a // - 81*a
x/3-(81*a) = 0
x/3-81*a = 0
1/3*x-81*a = 0 // + -81*a
1/3*x = -(-81*a) // : 1/3
x = (-(-81*a))/1/3
x = 243*a
x = 243*a
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