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/2.8-4.9 = -7.11 // + 7.11
x/2.8-4.9+7.11 = 0
0.35714286*x+2.21 = 0 // - 2.21
0.35714286*x = -2.21 // : 0.35714286
x = -2.21/0.35714286
x = -6.18799995
x = -6.18799995
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