21x+18=12x+81

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Solution for 21x+18=12x+81 equation:


Simplifying
21x + 18 = 12x + 81

Reorder the terms:
18 + 21x = 12x + 81

Reorder the terms:
18 + 21x = 81 + 12x

Solving
18 + 21x = 81 + 12x

Solving for variable 'x'.

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

Add '-12x' to each side of the equation.
18 + 21x + -12x = 81 + 12x + -12x

Combine like terms: 21x + -12x = 9x
18 + 9x = 81 + 12x + -12x

Combine like terms: 12x + -12x = 0
18 + 9x = 81 + 0
18 + 9x = 81

Add '-18' to each side of the equation.
18 + -18 + 9x = 81 + -18

Combine like terms: 18 + -18 = 0
0 + 9x = 81 + -18
9x = 81 + -18

Combine like terms: 81 + -18 = 63
9x = 63

Divide each side by '9'.
x = 7

Simplifying
x = 7

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