1}957-{t+336}=428 2}325-{a-617}=219

Question

1}957-{t+336}=428 2}325-{a-617}=219

Answer 1

1) 957-(t+336)=428, 957-t-336=428, 957-336-428=t, t=193;
2) 325-(a-617)=219, 325-a+617=219, 325+617-219=a, a=723