Question

(x+5)+(x+10)+(x+15)+(x+20)=74

Answer 1

(x+x+x+x)+(5+10+15+20)=74

4x+50=74

4x=74-50

4x=24

x=24:4

x=6 

vậy x=6

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Answer 2

(x+5)+(x+10)+(x+15)+(x+20)=74

(x+x+x+x)+(5+10+15+20)=74

4x  +50=74

4x=24

x=6

Answer 3

(x+5)+(x+10)+(x+15)+(x+20)=74

=> x+5+x+10+x+15+x+20=74

=> 4x + (5+10+15+20) =74

=> 4x+ 50=74

=>4x=74-50

=>4x=24

=>x=24:4

=>x=6

Kết luận : x = 6

=>5x=24

 =>x=24:5

=>x=4