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ca430017edbaddd2e1bf2fa1109d5395286353fe: $$
(x_0,t_0)

4e2080a484a7a111802520ef4532d89f8369c3ec: $$
x_0+ct_0

d94e229e0c153bdd05334e6c42f01f9c980f8368: $$
t

2e4245713e2c1363e309df705110d79cc788effe: $$
\color{red} x-ct=x_0-ct_0