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4x + 15x = 10 +8
19x = 18
x = 18/19
x = 0,947
Comprobación
19 . 0,947 = 18
17,993 = 18
redondeo
18= 18
El otro ejercicio
5x - 15 + 8 x = 7 x - 5
13x - 15 = 7x - 5
13x - 7x = -5 +15
6x = 10
x = 10/6
x = 5/3
Comprobación
6 . 5/3 = 10
30/3 = 10
simplifico
10 = 10