90-6x=21x+18

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Solution for 90-6x=21x+18 equation:


Simplifying
90 + -6x = 21x + 18

Reorder the terms:
90 + -6x = 18 + 21x

Solving
90 + -6x = 18 + 21x

Solving for variable 'x'.

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

Add '-21x' to each side of the equation.
90 + -6x + -21x = 18 + 21x + -21x

Combine like terms: -6x + -21x = -27x
90 + -27x = 18 + 21x + -21x

Combine like terms: 21x + -21x = 0
90 + -27x = 18 + 0
90 + -27x = 18

Add '-90' to each side of the equation.
90 + -90 + -27x = 18 + -90

Combine like terms: 90 + -90 = 0
0 + -27x = 18 + -90
-27x = 18 + -90

Combine like terms: 18 + -90 = -72
-27x = -72

Divide each side by '-27'.
x = 2.666666667

Simplifying
x = 2.666666667

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