Question

10x+1,5*(2,3-1,7)=13,9
Зайти X​

Answer 1

$10x + 1,5 * (2,3 - 1,7) = 13,9\\10x + 3,45 - 2,55 = 13,9\\10x = 13,9 - 3,45 + 2,55\\10x = 13\\x = 1,3$