3=c+7-13

Solution for 3=c+7-13 equation:

Simplifying
3 = c + 7 + -13

Reorder the terms:
3 = 7 + -13 + c

Combine like terms: 7 + -13 = -6
3 = -6 + c

Solving
3 = -6 + 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.
3 + -1c = -6 + c + -1c

Combine like terms: c + -1c = 0
3 + -1c = -6 + 0
3 + -1c = -6

Add '-3' to each side of the equation.
3 + -3 + -1c = -6 + -3

Combine like terms: 3 + -3 = 0
0 + -1c = -6 + -3
-1c = -6 + -3

Combine like terms: -6 + -3 = -9
-1c = -9

Divide each side by '-1'.
c = 9

Simplifying
c = 9