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20(3/4) =20x + 20 (1/5)
15 =20x +4
-20x =4-15
-20x= -11
x =11/20
la segunda
2x =2/3
6x=2
x=1/3
la tercera
x/7 =5
x =35
la cuarta
4 (x) -4(1/4)= 4(1/2)
4x -1 = 2
4x=3
x=3/4
la quinta
-x/7=-2
-x=-14 la incognita nunca debe ser negativa por eso lo multiplicas por -1 todo
X=14
la sexta
-x = -15
x = 15
la septima
x = 16
la octava
3(1/3) +3x =-15
1 +3x=-15
3x= -14
x=- 14/3