78=-2(m+3)+m

Solution for 78=-2(m+3)+m equation:

Simplifying
78 = -2(m + 3) + m

Reorder the terms:
78 = -2(3 + m) + m
78 = (3 * -2 + m * -2) + m
78 = (-6 + -2m) + m

Combine like terms: -2m + m = -1m
78 = -6 + -1m

Solving
78 = -6 + -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 = -6 + -1m + m

Combine like terms: -1m + m = 0
78 + m = -6 + 0
78 + m = -6

Add '-78' to each side of the equation.
78 + -78 + m = -6 + -78

Combine like terms: 78 + -78 = 0
0 + m = -6 + -78
m = -6 + -78

Combine like terms: -6 + -78 = -84
m = -84

Simplifying
m = -84