(12x+6)+(21x+9)=180

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Solution for (12x+6)+(21x+9)=180 equation:


Simplifying
(12x + 6) + (21x + 9) = 180

Reorder the terms:
(6 + 12x) + (21x + 9) = 180

Remove parenthesis around (6 + 12x)
6 + 12x + (21x + 9) = 180

Reorder the terms:
6 + 12x + (9 + 21x) = 180

Remove parenthesis around (9 + 21x)
6 + 12x + 9 + 21x = 180

Reorder the terms:
6 + 9 + 12x + 21x = 180

Combine like terms: 6 + 9 = 15
15 + 12x + 21x = 180

Combine like terms: 12x + 21x = 33x
15 + 33x = 180

Solving
15 + 33x = 180

Solving for variable 'x'.

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

Add '-15' to each side of the equation.
15 + -15 + 33x = 180 + -15

Combine like terms: 15 + -15 = 0
0 + 33x = 180 + -15
33x = 180 + -15

Combine like terms: 180 + -15 = 165
33x = 165

Divide each side by '33'.
x = 5

Simplifying
x = 5

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