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x in (-oo:+oo)
(a+x)/3 = c // - c
(a+x)/3-c = 0
(a+x)/3+(3*(-c))/3 = 0
a+3*(-c)+x = 0
a-3*c+x = 0
(a-3*c+x)/3 = 0
(a-3*c+x)/3 = 0 // * 3
a-3*c+x = 0
a-3*c+x = 0 // - a-3*c
x = -(a-3*c)
x = -(a-3*c)
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