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10z+10=20
Dividimos todo entre 10 para facilitar el cálculo:
z+1=2
Despejando a 'z':
z=2-1=1
Segundo ejercicio:
5x-(1/3)=(5/9)
Dejamos a 'x' de un lado:
5x=(5/9)+(1/3)
5x=(8/9)
Despejando a 'x':
x=(8/9)(1/5)=(8/45)
10z = 20 - 10
10z = 10
z = 10/10
z = 1
5x - 1/3 = 5/9
5x = 5/9 + 1/3
5 + 3 8
5x = ---------- = ----------
9 9
5x = 8/9
x = 8/9/5/1
x = 8/45