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t in (-oo:+oo)
(-4/7)*t-((1/2)*t)+9 = 261/14 // - 261/14
(-4/7)*t-((1/2)*t)-(261/14)+9 = 0
(-4/7)*t+(-1/2)*t-261/14+9 = 0
-15/14*t-135/14 = 0 // + 135/14
-15/14*t = 135/14 // : -15/14
t = 135/14/(-15/14)
t = -9
t = -9
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