(9+21)9=(13+c)13

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Solution for (9+21)9=(13+c)13 equation:


Simplifying
(9 + 21) * 9 = (13 + c) * 13

Combine like terms: 9 + 21 = 30
(30) * 9 = (13 + c) * 13

Multiply 30 * 9
270 = (13 + c) * 13

Reorder the terms for easier multiplication:
270 = 13(13 + c)
270 = (13 * 13 + c * 13)
270 = (169 + 13c)

Solving
270 = 169 + 13c

Solving for variable 'c'.

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

Add '-13c' to each side of the equation.
270 + -13c = 169 + 13c + -13c

Combine like terms: 13c + -13c = 0
270 + -13c = 169 + 0
270 + -13c = 169

Add '-270' to each side of the equation.
270 + -270 + -13c = 169 + -270

Combine like terms: 270 + -270 = 0
0 + -13c = 169 + -270
-13c = 169 + -270

Combine like terms: 169 + -270 = -101
-13c = -101

Divide each side by '-13'.
c = 7.769230769

Simplifying
c = 7.769230769

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