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t in (-oo:+oo)
t-((2/5)*(t-70))-70 = 0
(-2/5)*(t-70)+t-70 = 0
t-2/5*(t-70)-70 = 0
t-2/5*(t-70)-70 = 0
3/5*t-70+28 = 0
3/5*t-42 = 0
3/5*t-42 = 0
3/5*t-42 = 0 // + 42
3/5*t = 42 // : 3/5
t = 42/3/5
t = 70
t = 70
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