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)
0.003 = x/0.012 // - x/0.012
0.003-(x/0.012) = 0
0.003-83.33333333*x = 0
0.003-83.33333333*x = 0 // - 0.003
-83.33333333*x = -0.003 // : -83.33333333
x = -0.003/(-83.33333333)
x = 0.000036
x = 0.000036
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