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x=7-5 -x= -2-15
x=2 (-)-x = -17 (-)
x =17
3) x-2.3=5.9 4) x-7/4=5/4
x-6=45 x=5/4+7/4
x=45+6 x=12/4
x=51 x=3
4) 5/2+x=21/2 5) 16/3+x=7
x=21/2-5/2 x=7-16/3
x=16/2 x=21-16 (todo dividido entre 3)
x=8 x=5/3
6) 2/5+x-2=2/5
x=2/5-2/5+2
x=2