Explicación paso a paso:
a
[tex]x + 15 = 21 \\ x = 21 - 15 \\ x = 6[/tex]
b.
[tex]25 - x = 15 \\ 25 - 15 = x \\ 10 = x[/tex]
c.
[tex]3x = 9 \\ x = \frac{9}{3} \\ x = 3[/tex]
d.
[tex]2x + 2 = x + 7 \\ 2x - x = 7 - 2 \\ x = 5[/tex]
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Verified answer
Explicación paso a paso:
a
[tex]x + 15 = 21 \\ x = 21 - 15 \\ x = 6[/tex]
b.
[tex]25 - x = 15 \\ 25 - 15 = x \\ 10 = x[/tex]
c.
[tex]3x = 9 \\ x = \frac{9}{3} \\ x = 3[/tex]
d.
[tex]2x + 2 = x + 7 \\ 2x - x = 7 - 2 \\ x = 5[/tex]