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3x=5+4
3x=9
x=9/3
x=3
solucion: x=3
.............................
7x+5x=12-2
12x=10
x=10/12
x= 5
6
solucion: x= 5
6
3x -4 = 5
3x = 5 +4
3x = 9
x = 9/3
x = 3
b)
7x +5x = 12 -2
12x = 10
x = 10/12
x = 5/6