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1)
6 ( 2x - 5 ) + 2 = 20
12x - 30 + 2 = 20
12x = 20 + 30 - 2
12x = 48
x = 48/12
x = 4 → Solución
2 )
5 ( 3x - 1 ) + 3 = 13
15x - 5 + 3 = 13
15x = 13 + 5 - 3
15x = 15
x = 15/15
x = 1 → Solución
3 )
9 ( 7x - 2 ) - 10 = 36
63x - 18 - 10 = 36
63x = 36 + 18 + 10
63x = 64
x = 64/63 → Solución
4 )
12 + 3 ( 2x - 5 ) = 9
12 + 6x - 15 = 9
6x = 9 - 12 + 15
6x = 12
x = 12/6
x = 2 → Solución
5 )
25 - 5 ( 4 + 3x ) = 15
25 - 20 - 15x = 15
5 - 15x = 15
- 15x = 15 - 5
- 15x = 10
x = 10/ -15
x = - 2/3 → Solución
12x - 30 + 2 = 20
12x - 28 = 20
12x = 48
x = 48 / 12
x = 4
5 (3x - 1) + 3 = 13
15x - 5 + 3 = 13
15x - 2 = 13
15x = 15
x = 15 / 15
x = 1
9 (7x - 2) - 10 = 36
63x - 18 - 10 = 36
63x - 28 = 36
63x = 64
x = 64 / 63
12 + 3(2x-5) = 9
12 + 6x - 15 = 9
6x - 3 = 9
6x = 12
x = 12/6
x = 2
25 - 5(4+3x) = 15
25 - 20 - 15x = 15
-15x + 5 = 15
-15x = 10
x = 10/- 15
x = - 2/3