1.D-S=R
S=46141
R=46141-4379=41762
D-46141=41762 =>D=41762+46141
D=87903
2.a+b+c=376587
a+b=352277 =>c=376587-352277 =>c=24310
b+c=255545 =>a=376587-255545 =>a=121042
121042+b+24310=376587 =>b=376587-121042-24310
=>b=231235
3.21302+(23102+243251)=23102+266353=289455