Respuesta :

loreal33
Key word: sum


twice a number = 2n

Sum of that and 15 = 2n + 15


is = equals


Answer: 2n + 15 = 9
Glitch18

[tex] \huge \purple{\tt{Answer:}} [/tex]

Let the unknown number be x .

[tex] \Large{\underline{\sf{According~to~question}}} [/tex]

[tex] \sf {2x+15=9} \\\\\ \implies \sf{2x=9-15} \\\\\ \implies \sf {2x=-6} [/tex]

[tex] \implies {\sf {x ={ \dfrac{ - 6}{2}}}} \\\\\ \implies \sf{x=-3} [/tex]