If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
x/3 = a // - a
x/3-a = 0
1/3*x-a = 0 // + a
1/3*x = a // : 1/3
x = a/1/3
x = 3*a
x = 3*a
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