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/30 = 0.1 // - 0.1
x/30-0.1 = 0
1/30*x-0.1 = 0 // + 0.1
1/30*x = 0.1 // : 1/30
x = 0.1/1/30
x = 3.0000003
x = 3.0000003
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