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[tex]m = 1[/tex]
Step-by-step explanation:
[tex]2x + m = 7[/tex]
insert x=3 into the equation
[tex]2(3) + m = 7[/tex]
multiply
[tex]6 + m = 7[/tex]
subtract 6 on both sides
[tex]6 - 6 + m = 7 - 6[/tex]
[tex]m = 7 - 6[/tex]
simplify
[tex]m = 1[/tex]