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/0.3 = 0.7 // - 0.7
x/0.3-0.7 = 0
3.33333333*x-0.7 = 0 // + 0.7
3.33333333*x = 0.7 // : 3.33333333
x = 0.7/3.33333333
x = 0.21
x = 0.21
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