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3x=59-5
3x=54
x=54÷3
x=18
Verificación
5+3.18=59
5+54=59
2)5x+19=64
5x=64-19
5x=45
x=45÷5
x=9
Verificación
5.9+19=64
45+19=64
3)x+9=171
x=171-9
x=162
Verificación
162+9=8.20+11
171=171
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