[tex]a)2x + 7 = 9 \\ 2x = 9 - 7 \\ 2x = 2 \\ x = 1[/tex]
[tex]b)8m + 12 = - 36 \\ 8m = - 36 - 12 \\ 8m = - 48 \\ m = \frac{ - 48}{8} \\ m = - 6[/tex]
[tex]c) - 3y - 15 = - 57 \\ - 3y = - 57 + 15 \\ - 3y = - 42 \\ y = \frac{ - 42}{ - 3} \\ y = 14[/tex]
[tex]d)42 - 4p = - 39 \\ 42 + 39 = 4p \\ 81 = 4p \\ \frac{81}{4} = p[/tex]
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Verified answer
[tex]a)2x + 7 = 9 \\ 2x = 9 - 7 \\ 2x = 2 \\ x = 1[/tex]
[tex]b)8m + 12 = - 36 \\ 8m = - 36 - 12 \\ 8m = - 48 \\ m = \frac{ - 48}{8} \\ m = - 6[/tex]
[tex]c) - 3y - 15 = - 57 \\ - 3y = - 57 + 15 \\ - 3y = - 42 \\ y = \frac{ - 42}{ - 3} \\ y = 14[/tex]
[tex]d)42 - 4p = - 39 \\ 42 + 39 = 4p \\ 81 = 4p \\ \frac{81}{4} = p[/tex]