Question

Розв'яжiть рiвняння (21+75:(2x+13))×5=120

Answer 1

$(21 + 75 div (2x + 13)) = 120 div 5 \ (21 + 75 div (2x + 13)) = 24 \ 75 div (2x + 13) = 24 - 21 \ 75 div (2x + 13) = 3 \ 2x + 13 = 75 div 3 \ 2x + 13 = 25 \ 2x = 25 - 13 \ 2x = 12 \ x = 12 div 2 \ x = 6$