90-3x=21x

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Solution for 90-3x=21x equation:


Simplifying
90 + -3x = 21x

Solving
90 + -3x = 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 + -3x + -21x = 21x + -21x

Combine like terms: -3x + -21x = -24x
90 + -24x = 21x + -21x

Combine like terms: 21x + -21x = 0
90 + -24x = 0

Add '-90' to each side of the equation.
90 + -90 + -24x = 0 + -90

Combine like terms: 90 + -90 = 0
0 + -24x = 0 + -90
-24x = 0 + -90

Combine like terms: 0 + -90 = -90
-24x = -90

Divide each side by '-24'.
x = 3.75

Simplifying
x = 3.75

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