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t in (-oo:+oo)
3*t+7 = (-2/5)*t+1/5 // - (-2/5)*t+1/5
3*t-((-2/5)*t)-(1/5)+7 = 0
3*t+(2/5)*t-1/5+7 = 0
17/5*t+34/5 = 0 // - 34/5
17/5*t = -34/5 // : 17/5
t = -34/5/17/5
t = -2
t = -2
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