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)
1.5/10.5 = x // - x
1.5/10.5-x = 0
0.14285714-x = 0 // - 0.14285714
-x = -0.14285714 // * -1
x = 0.14285714
x = 0.14285714
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