N5 500-X=125+68 830+X = 1.230-157

500 – X = 125 + 68

500 – X = 193

X = 500 – 193

X = 307

830 + X = 1230 – 157

830 + X = 1073

X = 1073 – 830

X = 243

Ответ: X = 307; X = 243