Question

6•(2x+1)=78, 7•(3x-2)=70, 2•(x+5)-7=19, 3•(x+8)+23=80

Answer 1

1)  6 * (2x+1) = 78
12x + 6 = 78
12x = 78-6
x = 72/12
x = 6 

2) 7 * (3x - 2) = 70
  21x - 14 = 70
21x = 70 + 14
x = 84/21
x = 4

3)  2 * (x + 5) - 7 = 19
2x + 10 - 7 = 19
2x + 3 = 19
2x = 19 - 3
x = 16/2
x = 8
 
4)  3 * (x + 8) + 23 = 80
3x + 24 + 23 = 80
3x + 47 = 80
3x = 80 - 47
x = 33/3
x = 11