А+320=800-120 150+а=1000-540

Question

А+320=800-120
150+а=1000-540

Answer 1

A+320=680
a=680-320
a=360

150+a=460
a=460-150
a=310

Answer 2

А +320=680
680-320 =360

Comments

а+320=800-120
а=680-320
а=360
360+320=680
680=680
_____________
150+а=460
а=460-150
а=310
150+310=460
460=460