If it's not what You are looking for type in the equation solver your own equation and let us solve it.
t in (-oo:+oo)
t/6.87 = -0.2 // + 0.2
t/6.87+0.2 = 0
0.14556041*t+0.2 = 0 // - 0.2
0.14556041*t = -0.2 // : 0.14556041
t = -0.2/0.14556041
t = -1.37399998
t = -1.37399998
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