20+-7c=-15

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Solution for 20+-7c=-15 equation: 


Simplifying
20 + -7c = -15

Solving
20 + -7c = -15

Solving for variable 'c'.

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

Add '-20' to each side of the equation.
20 + -20 + -7c = -15 + -20

Combine like terms: 20 + -20 = 0
0 + -7c = -15 + -20
-7c = -15 + -20

Combine like terms: -15 + -20 = -35
-7c = -35

Divide each side by '-7'.
c = 5

Simplifying
c = 5

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