Question

No entiendo estas ecuaciones 3(x-1)-20=7 ,2(x+3)+5=9 ,2x-3=x+5
3 2

Answer 1

3(x-1)-20=7 
3x-3-20 = 7
3x -23 = 7
3x = 7 + 23
3x = 30
x = 10

2(x+3)+5=9
2x+6+5=9
2x+11=9
2x = 9 - 11
2x = -2
x = -1

2x-3=x+5
2x - x = 5 + 3
x = 8