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-5t+t-6-7t+8t+2+2t = -t-4 = 3,2-4 = -0,8
b) -7x+6y+3x-2y+x-3y dla x=-2/3 i y=4/7
-7x+6y+3x-2y+x-3y = -3x+y = 2+4/7 = 2 i 4/7
-5t+t-6-7t+8t+2+2t=-t-4
-t-4=-(-3,2)-4=-0,8
b) -7x+6y+3x-2y+x-3y dla x=-2/3 i y=4/7
-7x+6y+3x-2y+x-3y=-3x+y
-3x+y=-3* -2/3 +4/7=2 + 4/7=14/7 + 4/7=18/7=2 i 4/7