If it's not what You are looking for type in the equation solver your own equation and let us solve it.
a in (-oo:+oo)
a/1.2 = 0.3 // - 0.3
a/1.2-0.3 = 0
0.83333333*a-0.3 = 0 // + 0.3
0.83333333*a = 0.3 // : 0.83333333
a = 0.3/0.83333333
a = 0.36
a = 0.36
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