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t in (-oo:+oo)
(6/7)*t+2 = -40/7 // + -40/7
(6/7)*t-(-40/7)+2 = 0
(6/7)*t+40/7+2 = 0
6/7*t+54/7 = 0 // - 54/7
6/7*t = -54/7 // : 6/7
t = -54/7/6/7
t = -9
t = -9
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