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7x=2-9
7x=-7
x=-7/7
x=1
2x-6=-6
2x=-6+6
2x=0
x=0
3+5x=-7
5x=-7-3
5x=-10
x=-10/5
x=-2
9 + 7x = 2
7x = 2 - 9
7x = -7
x = (-7)/7
x = -1 → respuesta
2x - 6 = -6
2x = -6 +6
2x = 0 → no hay solución para esta ecuación
3 + 5x = -7
5x = -7 -3
5x = -10
x = (-10)/5
x = -2 → respuesta