1.
[tex]9 - 7(x + 3) = 5 - 4x[/tex]
[tex]9 - 7x - 21 = 5 - 4x[/tex]
[tex] - 12 - 7x = 5 - 4x[/tex]
[tex] - 7x + 4x = 5 + 12[/tex]
[tex] - 3x = 17[/tex]
[tex]x = - \frac{17}{3} [/tex]
2.
[tex] |5x - 15| = 60[/tex]
[tex]5x - 15 = 60 \\ 5x - 15 = - 60[/tex]
[tex]x = 15 \\ x = - 9[/tex]
[tex] x_{1} = - 9[/tex]
[tex] x_{2} = 15[/tex]
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Answers & Comments
1.
[tex]9 - 7(x + 3) = 5 - 4x[/tex]
[tex]9 - 7x - 21 = 5 - 4x[/tex]
[tex] - 12 - 7x = 5 - 4x[/tex]
[tex] - 7x + 4x = 5 + 12[/tex]
[tex] - 3x = 17[/tex]
[tex]x = - \frac{17}{3} [/tex]
2.
[tex] |5x - 15| = 60[/tex]
[tex]5x - 15 = 60 \\ 5x - 15 = - 60[/tex]
[tex]x = 15 \\ x = - 9[/tex]
[tex] x_{1} = - 9[/tex]
[tex] x_{2} = 15[/tex]