Question

Solve the equation78=-2(m+3)+m

Answer 1

start on the right
distribute the -2 to get rid of the parenthesis
to get rid of parenthesis multiply each term inside by what is outside

regroup to isolate the variables to one side and the constants to the other.
this is an equation so whatever you do to one side also do to the other to maintain the balance.

now divide each side by the coefficient of the variable to get one time the variable