Question

Х+Х+18=78 решите уравнение

Answer 1

Х + Х + 18 = 78

Х + Х = 78 - 18

Х + Х = 60

Х = 60 : 2

Х = 30

Answer 2

X+x+18=78+x=78-18x+x=60x=60:2x=30