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/4.5+2.8 = 7.9 // - 7.9
x/4.5-7.9+2.8 = 0
0.22222222*x-5.1 = 0 // + 5.1
0.22222222*x = 5.1 // : 0.22222222
x = 5.1/0.22222222
x = 22.95000023
x = 22.95000023
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