Respuesta:
a)
[tex]x + 4 - 9 = 20 \\ x = 20 - 4 + 9 \\ x = 16 + 9 \\ x = 25[/tex]
b) no hay incógnita
c) no hay incógnita
d) el 5 es +5 o -5?
si es +5:
[tex]2x + 5 = 11 \\ 2x = 11 - 5 \\ 2x = 6 \\ x = 6 \div 2 \\ x = 3[/tex]
si es -5:
[tex]2x - 5 = 11 \\ 2x = 11 + 5 \\ 2x = 16 \\ x = 16 \div 2 \\ x = 8[/tex]
e)
[tex]w - 4 = 14 \\ w = 14 + 4 \\ w = 18[/tex]
f) 3 es +3 o -3?
si es +3:
[tex]3x + 3 = 15 \\ 3x = 15 - 3 \\ 3x = 12 \\ x = 12 \div 3 \\ x = 4[/tex]
si es -3:
[tex]3x - 3 = 15 \\ 3x = 15 + 3 \\ 3x = 18 \\ x = 18 \div 3 \\ x = 6[/tex]
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Respuesta:
a)
[tex]x + 4 - 9 = 20 \\ x = 20 - 4 + 9 \\ x = 16 + 9 \\ x = 25[/tex]
b) no hay incógnita
c) no hay incógnita
d) el 5 es +5 o -5?
si es +5:
[tex]2x + 5 = 11 \\ 2x = 11 - 5 \\ 2x = 6 \\ x = 6 \div 2 \\ x = 3[/tex]
si es -5:
[tex]2x - 5 = 11 \\ 2x = 11 + 5 \\ 2x = 16 \\ x = 16 \div 2 \\ x = 8[/tex]
e)
[tex]w - 4 = 14 \\ w = 14 + 4 \\ w = 18[/tex]
f) 3 es +3 o -3?
si es +3:
[tex]3x + 3 = 15 \\ 3x = 15 - 3 \\ 3x = 12 \\ x = 12 \div 3 \\ x = 4[/tex]
si es -3:
[tex]3x - 3 = 15 \\ 3x = 15 + 3 \\ 3x = 18 \\ x = 18 \div 3 \\ x = 6[/tex]