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t in (-oo:+oo)
(-2/5)*t+7 = 131/5-2*t // - 131/5-2*t
(-2/5)*t-(-2*t)-(131/5)+7 = 0
(-2/5)*t+2*t-131/5+7 = 0
8/5*t-96/5 = 0 // + 96/5
8/5*t = 96/5 // : 8/5
t = 96/5/8/5
t = 12
t = 12
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