-5t+t-6-7t+8t+2+2t=-5(-3,2)+(-3,2)-6-7(-3,2)+8(-3,2)+2+2(-3,2)=16-3,2-6+22,4-25,6+2-6,4=-0,8
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-7x+6y+3x-2y+x-3y=-7(-\frac{2}{3})+6*\frac{4}{7}+3(-\frac{2}{3})-2*\frac{4}{7}+(-\frac{2}{3})-3*\frac{4}{7}=\frac{14}{3}+\frac{24}{7}-\frac{6}{3}-\frac{8}{7}-\frac{2}{3}-\frac{12}{7}=\frac{6}{3}-\frac{4}{7}=3-\frac{4}{7}=2\frac{3}{7}