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t in (-oo:+oo)
-((4/5)*t)-1/2 = -13/10 // + -13/10
-((4/5)*t)-1/2-(-13/10) = 0
(-4/5)*t-1/2+13/10 = 0
4/5-4/5*t = 0 // - 4/5
-4/5*t = -4/5 // : -4/5
t = -4/5/(-4/5)
t = 1
t = 1
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