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-4 + 2u = - 3 u / - 2u
-4 = -5u
u = -4 : -5
u = 0.8
3-x=-2x / -3
-x = -2x - 3 / +2x
x = - 3
5+2u=9-3u
2u+3u=9-5
5u=4 //÷ (obie strony dzielimy przez 5)
u=⁴/₅
⁴/₅=0.8
2)
3-x=-2x
-x+2x=-3
x=-3
2u+3u=9-5
5u=4 / : 5
u= 0,8
3-x= -2x
-x+2x=-3
x=-3