Question

considere a igualdade : (5a + 3 2b - 7 )
(c + 5 d - 3 ) igual a =
(4a 1)
(0 5)

Answer 1

(5a + 3     2b - 7)  =    (4a   1)
(c + 5        d - 3 )         (0     5)

5a + 3 = 4a      2b - 7 = 1
c + 5 = 0          d - 3 = 5

5a + 3 = 4a            
5a - 4a = - 3            
a = - 3

c + 5 = 0
c = - 5

2b - 7 = 1
2b = 1 + 7
2b = 8
b = 8/2
b = 4

d - 3 = 5
d = 5 + 3
d = 8