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20 - 7X = 6X - 6
-7x - 6x = -6 - 20
-13x = -26
x = -26/-13
x = 2
Solución :
x = 2
2)
7x + 2 = 10x + 5
7x - 10x = 5 - 2
-3x = 3
x = 3/-3
x = -1
Solución :
x = -1
3)
6x − 5 = 8x + 2
6x - 8x = 2 + 5
-2x = 7
x = 7/-2
Solución :
x = 7/-2
4)
4x + 4 + 9x + 18 = 12 (x+2)
4x + 4 + 9x + 18 = 12x + 24
4x + 9x - 12x = 24 - 18 - 4
x = 2
Solución :
x = 2