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t in (-oo:+oo)
-2*t-(1/7) = (1/4)*t-1/7 // - (1/4)*t-1/7
-2*t-((1/4)*t)-(1/7)-(-1/7) = 0
(-1/4)*t-2*t-1/7+1/7 = 0
-9/4*t = 0 // : -9/4
t = 0
t = 0
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