30+12=c-42

Solution for 30+12=c-42 equation:

Simplifying
30 + 12 = c + -42

Combine like terms: 30 + 12 = 42
42 = c + -42

Reorder the terms:
42 = -42 + c

Solving
42 = -42 + c

Solving for variable 'c'.

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

Add '-1c' to each side of the equation.
42 + -1c = -42 + c + -1c

Combine like terms: c + -1c = 0
42 + -1c = -42 + 0
42 + -1c = -42

Add '-42' to each side of the equation.
42 + -42 + -1c = -42 + -42

Combine like terms: 42 + -42 = 0
0 + -1c = -42 + -42
-1c = -42 + -42

Combine like terms: -42 + -42 = -84
-1c = -84

Divide each side by '-1'.
c = 84

Simplifying
c = 84