Question

X-54=85
X+186=578
50x+400=3400

Answer 1

Explicación paso a paso:

X-54=85 =>85+54= 139

139-54=85

X+186=578 => 578-186=392

392+186=578

50x+400=3400 => 3400-400= 3000 y 3000÷50=60

50(60)+400=3400