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4/3 x + 5 = -3 + 5/7 x agrupa 5/7 pasa negativo por estar positivo
4/3 x - 5/7 x = -3 - 5 m.c.m de 3 y 7 = 21 21/3*4=28 21/7*5=15
28/21 x - 15/21 x = -8
13/21 x = -8
x = -8 ÷ 13/21
x = (-8*21)/13
x = -168/13
S = { -168/13 } Respuesta de la primera
8x - 7 = 4x - 2/3
8x - 4x = -2/3 + 7 =
4x = 19/3
x = 19/3 ÷ 4
x = 19/12
S = { 19/12 }