21x-63+6x+240=420

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Solution for 21x-63+6x+240=420 equation:


Simplifying
21x + -63 + 6x + 240 = 420

Reorder the terms:
-63 + 240 + 21x + 6x = 420

Combine like terms: -63 + 240 = 177
177 + 21x + 6x = 420

Combine like terms: 21x + 6x = 27x
177 + 27x = 420

Solving
177 + 27x = 420

Solving for variable 'x'.

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

Add '-177' to each side of the equation.
177 + -177 + 27x = 420 + -177

Combine like terms: 177 + -177 = 0
0 + 27x = 420 + -177
27x = 420 + -177

Combine like terms: 420 + -177 = 243
27x = 243

Divide each side by '27'.
x = 9

Simplifying
x = 9

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