Question

3,6 х + 8,4 х = 76,8​

Answer 1

3,6 х + 8,4 х = 76,8

12х=76.8

х=6.4

Answer 2

$3.6x + 8.4x = 76.8 \ 12x = 76.8 \ x = 76.8 div 12 \ x = 6.4$