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2) x= 8
3) x= 50/3
7x - 10 = 3x + 6
7x - 3x = 6 + 10
4x = 16
x = 16/4
x = 4
2)
5(3x -10) = 5x + 30
15x - 50 = 5x + 30
15x - 5x = 30 +50
10x = 80
x = 80/10
x = 8
A la última parece que le falta algo, o es igual a 0?