c-42=2(m-20)

Solution for c-42=2(m-20) equation:

Simplifying
c + -42 = 2(m + -20)

Reorder the terms:
-42 + c = 2(m + -20)

Reorder the terms:
-42 + c = 2(-20 + m)
-42 + c = (-20 * 2 + m * 2)
-42 + c = (-40 + 2m)

Solving
-42 + c = -40 + 2m

Solving for variable 'c'.

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

Add '42' to each side of the equation.
-42 + 42 + c = -40 + 42 + 2m

Combine like terms: -42 + 42 = 0
0 + c = -40 + 42 + 2m
c = -40 + 42 + 2m

Combine like terms: -40 + 42 = 2
c = 2 + 2m

Simplifying
c = 2 + 2m