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x = (19-5)/2 = 7
2)
x = (5/4)+(1/2) = 7/4
3)
x = (38+11)/7 = 7
4)
x = 18.3+10.5 = 28.8
2x=19-5
2x=14
X= 14/2= 7
X-1/2=5/4
X= 5/4+1/2 ( para operar con fracciones deben de tener el mismo denominador así que se hace mcm que en este caso es 4)
X= 5/4+2/4= 7/4
7x-11= 38
7x= 38-11
7x=27
X= 27/7
X-10,5= 18,3
X= 18,3-10,5
X= 7,8