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t in (-oo:+oo)
87/8 = 6*t+(1/2)*t+6 // - 6*t+(1/2)*t+6
87/8-(6*t)-((1/2)*t)-6 = 0
(-1/2)*t-6*t+87/8-6 = 0
39/8-13/2*t = 0 // - 39/8
-13/2*t = -39/8 // : -13/2
t = -39/8/(-13/2)
t = 3/4
t = 3/4
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