Explicație pas cu pas:
x=10*c1+8/+2=>x+2=10c1+10=>x+2=10(c1+1)
x=12*c2+10/+2=>x+2=12(c2+1)
x=18*c3+16/+2=>x+2=18(c3+1)
x+2 este multiplul comun al nr 10, 12, 18
10=2*5
12=2*2*3
18=2*3*3
cmmmc=2*2*3*3*5=180
500<y*180<600/:10
50<y*18<60/:2
25<y*9<30
y=3
x+2=180*3
x=538
