240:(х+3)-5=7

Question

240:(х+3)-5=7

Answer 1

умножаем все на (х+3)

240-5(х+3)=7(х+3)

240-5х-15=7х+21

240-15-21=7х+5х

204=12х

х=204/12

х=17

 

Answer 2

240:(х+3)-5=7

240:(х+3)=7+5

240:(х+3)=12

х+3=240:12

х+3=20

х=20-3

х=17