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)
10-x = x-4 // - x-4
4-x-x+10 = 0
14-2*x = 0 // - 14
-2*x = -14 // : -2
x = -14/(-2)
x = 7
x = 7
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