Question

x*3=70-40. 120:x=100-80. x:4=80+80. 5*x=125+325

Answer 1

x=10. x=1,2 . x=640. x=90

Answer 2

x*3=30  х=30/3  х=10
120/х=20  х=120/20  х=6
х/4=160  х=160*4  х=640
5*х=450  х=450/5  х=90