1899*(3935-х)=0 1534:(219+х)=1 28а-15а-9а=368

Question

1899*(3935-х)=0 1534:(219+х)=1 28а-15а-9а=368

Answer 1

1899 * (3935-х)=0
3935 - x = 0
x = 3935

1534 : (219 + х) = 1
219 + x = 1534
x = 1534 - 219
x = 1315

28а - 15а - 9а = 368
4a = 368
a = 368 / 4
a = 92