X*x-10+21=0

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Solution for X*x-10+21=0 equation:


Simplifying
X * x + -10 + 21 = 0

Multiply X * x
xX + -10 + 21 = 0

Reorder the terms:
-10 + 21 + xX = 0

Combine like terms: -10 + 21 = 11
11 + xX = 0

Solving
11 + xX = 0

Solving for variable 'x'.

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

Add '-11' to each side of the equation.
11 + -11 + xX = 0 + -11

Combine like terms: 11 + -11 = 0
0 + xX = 0 + -11
xX = 0 + -11

Combine like terms: 0 + -11 = -11
xX = -11

Divide each side by 'X'.
x = -11X-1

Simplifying
x = -11X-1

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