21x*2-13x-20=0

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Solution for 21x*2-13x-20=0 equation:


Simplifying
21x * 2 + -13x + -20 = 0

Reorder the terms for easier multiplication:
21 * 2x + -13x + -20 = 0

Multiply 21 * 2
42x + -13x + -20 = 0

Reorder the terms:
-20 + 42x + -13x = 0

Combine like terms: 42x + -13x = 29x
-20 + 29x = 0

Solving
-20 + 29x = 0

Solving for variable 'x'.

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

Add '20' to each side of the equation.
-20 + 20 + 29x = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 29x = 0 + 20
29x = 0 + 20

Combine like terms: 0 + 20 = 20
29x = 20

Divide each side by '29'.
x = 0.6896551724

Simplifying
x = 0.6896551724

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