9x+28=2755, 510+14x=76, 5y-97=943, 410-7x=151

9*x+28=2755;
9*x=2755-28;
9*x=2727;
x=2727/9;
x=303;

510+14*x=76;
14*x=-510+76;
14*x=-434;
x=-434/14;
x=-31;

5*y-97=943;
5*y=943-97;
5*y=846;
y=846/5;
y=169,2;

410-7*x=151;
-7*x=-410+151;(*-1)
7*x=410-151;
7*x=259;
x=259/7;
x=37;