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b) 3t-2t=2+11 t=13, 2u+3u=9-5 5u=4 u= 4:5
3.a) -5+x=10 x=10+5 x=15,
5x=-35+34 5x=-1/: 5 x= -1:5,
4x-3x=-5 x=-5
b) x= 46-64 x=-18,
-x+2x=3 x=3,
9x-2x=2-4 x=-2
c)-x=0.5-0.25 x=-0.25,
2x= -1-1:7 2x=-8:7 /;2 x=-8:14