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2x= 1,80
x= 0,90
zeszyt - 1,85 zl
ołówkek - 0,90 zl
x + 0,95 - cena zeszytu
x+0,95+x=2,75 | -0,95
2x=1,8 | :2
x=0,9
0,90=0,95 =1,85
ołówek 90 gr
zeszt 1,85 zł
zeszyt +ołówek =2, 75
2,75-95 gr =1,80 zł