Question

Despeja d.
2(5−d)=2−4d
d=??

Answer 1

10-2d=2-4d
10-2=-4d+2d
8=-2d
-4=d

Answer 2

2(5-d)=2-4d

10-2d=2-4d
-2d+4d=2-10
2d=-8
d=-8/2
d=-4 (simplificado)

Comprobación:
2(5-(-4))=2-4(-4)
2(5+4)=2+16
2(9)=18
18=18