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-(1/2) = 4/10 // - 4/10
x-(1/2)-(4/10) = 0
x-1/2-2/5 = 0
x-9/10 = 0 // + 9/10
x = 9/10
x = 9/10
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