Question

78= -2(m+3) +m
can someone help me out?

Answer 1

Since m is on the right-hand side of the equation, switch the sides so it is on the lefthand side of the equation
-2(m+3)+m=78

multiply -2 by each term inside the parentheses
-2m-6+m=78

Since -2m and m are like terms, subtract m from -2m
-m-6=78

Move all terms not containing m to the right side of the equation.
-m=84

multiply -m by -1
m=84*-1

Divide each term in the equation by -1.
m=-84

Answer 2

78 = -2(m+3) + m
78 = m(-2) + 3(-2) + m
78 = -2m - 6 + m
78 + 6 = -2m + m
84 = -m
m = -84

Answer 3

78=-2(m-3)+m
I think it looks neater when
(m+84)=0, where m=-84