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)
4.5/12 = 4*x // - 4*x
4.5/12-(4*x) = 0
4.5/12-4*x = 0
0.375-4*x = 0 // - 0.375
-4*x = -0.375 // : -4
x = -0.375/(-4)
x = 0.09375
x = 0.09375
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