Question

Aflați x din egalitatea :

Answer 1

2 × 25 - 5 × [9 + 5 - 3 × (2x - 1)] = 25

50 - 5 × [14 - 3 × (2x - 1)] = 25

5 × [14 - 3 × (2x - 1)] = 50 - 25

5 × [14 - 3 × (2x - 1)] = 25

14 - 3 × (2x - 1) = 25 : 5

14 - 3 × (2x - 1) = 5

3 × (2x - 1) = 14 - 5

3 × (2x - 1) = 9

2x - 1 = 9 : 3

2x - 1 = 3

2x = 3 + 1

2x = 4

x = 4 : 2

x = 2

Answer 2

2*25-5*[9+5-3*(2x-1)]=25
50-5(9+5-6x+3)=25
50-45-25+30x-15=25
-35+30x=25
30x=25+35
30x=60
x=60:30
x=2