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t in (-oo:+oo)
(-6/7)*t-4 = -94/7 // + -94/7
(-6/7)*t-(-94/7)-4 = 0
(-6/7)*t+94/7-4 = 0
66/7-6/7*t = 0 // - 66/7
-6/7*t = -66/7 // : -6/7
t = -66/7/(-6/7)
t = 11
t = 11
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