Explicație pas cu pas:
x-123 255=973 418-432 505
x-123 255=540 913
x=540 913+123 255
×=664 168
x+210 543=129 320+378 143
×+210 543=507 463
x=507 463-210 543
x=296 920
×+584 347=372 104+425 381
×+584 347=797 485
x=797 485-584 347
x=213 138
x-354 125=241 317+102 529
×-354 125=343 846
x=343 847+354 125
x=697 971