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10x - 30x = - 30 + 80
- 20x = 50
x = 50/20 ---> respuesta
4x + 17 = 6x - 18
4x - 6x = - 18 - 17
- 2x = - 35
x = 35/2 ---> respuesta
48x + 12 = 104 + 3x
48x - 3x = 104 - 12
45x = 92
x = 92/45 ---> respuesta
33 - 11x = 30 - 20x
33 - 30 = - 20x + 11x
3 = - 9x
-3/9 = x ---> respuesta