374-(200+74)=100
743-(500+20)=223
313-(107+206)=0
635-(80+135)=420
426-(326+10)=90
529-(64+136)=329
681-(81+130)=470
377-(37+140)=200
295-(157+43)=95
485+Х=700
х=700-485
х=215
Х+250=867
х=867-250
х=617
317-Х=283
х=317-283
х=34
632-Х=247
х=632-247
х=385
Х-148=359
х=359+148
х=507
Х-465=175
х=175+465
х=640