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2x=7-5
2x=2
x=2/2=1
b)5/3=10x-7/6(x-1)
5/3=[60x-7(x-1)]/6
30=3[60x-7x+7]
30/3=53x+7
10-7=53x
3=53x
x=3/53
c)2x-2=2(x-1)
2x-2=2x-2
0
d)7(2x+1)=14x
14x+14=14x
14x-14x=-14
0=-14 No
no tiene solucion