21x+30=9x+66

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Solution for 21x+30=9x+66 equation:


Simplifying
21x + 30 = 9x + 66

Reorder the terms:
30 + 21x = 9x + 66

Reorder the terms:
30 + 21x = 66 + 9x

Solving
30 + 21x = 66 + 9x

Solving for variable 'x'.

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

Add '-9x' to each side of the equation.
30 + 21x + -9x = 66 + 9x + -9x

Combine like terms: 21x + -9x = 12x
30 + 12x = 66 + 9x + -9x

Combine like terms: 9x + -9x = 0
30 + 12x = 66 + 0
30 + 12x = 66

Add '-30' to each side of the equation.
30 + -30 + 12x = 66 + -30

Combine like terms: 30 + -30 = 0
0 + 12x = 66 + -30
12x = 66 + -30

Combine like terms: 66 + -30 = 36
12x = 36

Divide each side by '12'.
x = 3

Simplifying
x = 3

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