78=-2(m+2)+m

Solution for 78=-2(m+2)+m equation:

Simplifying
78 = -2(m + 2) + m

Reorder the terms:
78 = -2(2 + m) + m
78 = (2 * -2 + m * -2) + m
78 = (-4 + -2m) + m

Combine like terms: -2m + m = -1m
78 = -4 + -1m

Solving
78 = -4 + -1m

Solving for variable 'm'.

Move all terms containing m to the left, all other terms to the right.

Add 'm' to each side of the equation.
78 + m = -4 + -1m + m

Combine like terms: -1m + m = 0
78 + m = -4 + 0
78 + m = -4

Add '-78' to each side of the equation.
78 + -78 + m = -4 + -78

Combine like terms: 78 + -78 = 0
0 + m = -4 + -78
m = -4 + -78

Combine like terms: -4 + -78 = -82
m = -82

Simplifying
m = -82