(490 - x) - 250 = 70240 - x = 70-x = -170x = 170
5a + 500 = 45005a = 4000a = 800
a + 156 = 17 * 20a + 156 = 340a = 340 - 156a = 184
Therefore, the solutions are:x = 170a = 800a = 184
(490 - x) - 250 = 70
240 - x = 70
-x = -170
x = 170
5a + 500 = 4500
5a = 4000
a = 800
a + 156 = 17 * 20
a + 156 = 340
a = 340 - 156
a = 184
Therefore, the solutions are:
x = 170
a = 800
a = 184