Respuesta:
2x-(1-6x) = 15
2x-1+6x = 15
(2+6)x-1 = 15
8x-1 = 15
8x-1+1 = 15+1
8x = 16
(8/8)x = 16/8
x = 2
Comprobación :
2(2)-(1-6(2)) = 15
4-(1-12) = 15
4-(-11) = 15
4+11 = 15
15 = 15
R// El valor de " x " es 2
