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t in (-oo:+oo)
1/2-((2/5)*t) = (-2/3)*t-(17/30) // - (-2/3)*t-(17/30)
1/2-((2/5)*t)-((-2/3)*t)+17/30 = 0
(-2/5)*t+(2/3)*t+1/2+17/30 = 0
4/15*t+16/15 = 0 // - 16/15
4/15*t = -16/15 // : 4/15
t = -16/15/4/15
t = -4
t = -4
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