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t in (-oo:+oo)
(1/3)*t-2/7 = -5/42 // + -5/42
(1/3)*t-2/7-(-5/42) = 0
(1/3)*t-2/7+5/42 = 0
1/3*t-1/6 = 0 // + 1/6
1/3*t = 1/6 // : 1/3
t = 1/6/1/3
t = 1/2
t = 1/2
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