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a ) 4 . ( 1/3 x - 3/4 ) = - 2/9 . ( x - 1 /2 )
= 4((1/3)x - 3/4) = - 2/9(x - 1/2)
= 36((1/3)x - 3/4) = - 2(x - 1/2) = -2x + 1
= 12x - 12 = -2x + 1
14x = 13
x = 13/14
b) 1/5 x + 0,5 = x + 6/5 - 3/9 x= (1/5)x + 5/10 = x + 6/5 - (3/9)x(1/5)x - x + (3/9)x = 6/5 - 5/10 = 12/10 - 5/10 = 7/10
convertimos las fracciones a denominador común 45:
(9/45 - 45/45 + 15/45)x = 7/10
-(21/45)x = 7/10
x = -(7*45)/(10*21)
x = -315/210