1 способ.

(45+s)-7 = 218
2 способ.

(45+s)-7 = 218

1 способ.(45+s)-7 = 21845+s=218+745+s=225s=225-45s=1802 способ.(45+s)-7 = 21845+s-7=21845-7+s=21838+s=218s=218-38s=180

45+s=218+745+s=225s=225-45s=180