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t in (-oo:+oo)
(19/21)*t = -38/7 // + -38/7
(19/21)*t-(-38/7) = 0
(19/21)*t+38/7 = 0
19/21*t+38/7 = 0 // - 38/7
19/21*t = -38/7 // : 19/21
t = -38/7/19/21
t = -6
t = -6
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