1) x:6-246=132 <=> x:6=132+246<=>x:6=378<=>x=378*6<=>x=2268
2)54:m=740-734<=> 54:m=6 <=>m=54:6 <=>m=9
3)n:9=873-549 <=>n:9=324<=>n=324:9<=>n=36
4)y:2=145+275<=>y:2=420<=>y=420*2<=>y=210
5)48:z=887-879<=>48:z=8<=>z=48:8 <=>z=6
6)b:7=974-969<=>b:7=5<=>b=7*5<=>b=35