primul mod: 14,05-12,x=1,45
1405 supra 100-12x supra 10=145 supra 100
1405 supra 100-10*12x supra 100=145 supra 100
1405-10*12x supra 100=145 supra 100
1405-10*12x=145
10*12x=1405-145
10*12x=1260
12x=1260:10
12x=126
x=6
al doilea mod: 14,05-12,x=1,45
12,x=14,05-1,45
12,x=12,6
x=6
