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El numero que no conoces lo llamas y
4 x(5 + y) = 36
5 + y = 36/4
5 + y = 9
y = 9 - 4
y = 4
4x(5 + 4)v= 36
30 - y)/5 + 4 = 8
(30 - y)/5 = 8 - 4
(30 - y)/5 = 4
30 - y = 4 * 5
30- y = 20
30 - 20 = y
10 = y
(30 - 10)/5 + 4 = 8
(30 - y)/8 = 25
30 - y = 25 * 8
30 - y = 200
30 - 200 = y
- 170 = y
(30 -( - 170))/8 = 25
Este lo hacemos cuadrando numeros.
18x + 4x = 56
18 x 2 + 4 * 5 = 56