3x^2+18=21x^2

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Solution for 3x^2+18=21x^2 equation: 


Simplifying
3x2 + 18 = 21x2

Reorder the terms:
18 + 3x2 = 21x2

Solving
18 + 3x2 = 21x2

Solving for variable 'x'.

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

Add '-21x2' to each side of the equation.
18 + 3x2 + -21x2 = 21x2 + -21x2

Combine like terms: 3x2 + -21x2 = -18x2
18 + -18x2 = 21x2 + -21x2

Combine like terms: 21x2 + -21x2 = 0
18 + -18x2 = 0

Add '-18' to each side of the equation.
18 + -18 + -18x2 = 0 + -18

Combine like terms: 18 + -18 = 0
0 + -18x2 = 0 + -18
-18x2 = 0 + -18

Combine like terms: 0 + -18 = -18
-18x2 = -18

Divide each side by '-18'.
x2 = 1

Simplifying
x2 = 1

Take the square root of each side:
x = {-1, 1}

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