Răspuns :
[tex] \frac{30}{100}\cdot{x}+140=x [/tex]
[tex] \frac{30x}{100}+140=x [/tex]
30x+14 000 = 100x
14 000=70x
x=200
[tex] \frac{30x}{100}+140=x [/tex]
30x+14 000 = 100x
14 000=70x
x=200
x-cartea
x-30/100 × x=140
x-30x/100=140
100x-30x/100=140
70x/100=140
x=100× 140/70
x=200
x-30/100 × x=140
x-30x/100=140
100x-30x/100=140
70x/100=140
x=100× 140/70
x=200