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t in (-oo:+oo)
3*(-(6*t)-1) = 213 // - 213
3*(-(6*t)-1)-213 = 0
3*(-6*t-1)-213 = 0
3*(-6*t-1)-213 = 0
-18*t-216 = 0
-18*t-216 = 0
-18*t-216 = 0 // + 216
-18*t = 216 // : -18
t = 216/(-18)
t = -12
t = -12
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