21+(20-4x)-(11-2x)=0

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Solution for 21+(20-4x)-(11-2x)=0 equation:


Simplifying
21 + (20 + -4x) + -1(11 + -2x) = 0

Remove parenthesis around (20 + -4x)
21 + 20 + -4x + -1(11 + -2x) = 0
21 + 20 + -4x + (11 * -1 + -2x * -1) = 0
21 + 20 + -4x + (-11 + 2x) = 0

Reorder the terms:
21 + 20 + -11 + -4x + 2x = 0

Combine like terms: 21 + 20 = 41
41 + -11 + -4x + 2x = 0

Combine like terms: 41 + -11 = 30
30 + -4x + 2x = 0

Combine like terms: -4x + 2x = -2x
30 + -2x = 0

Solving
30 + -2x = 0

Solving for variable 'x'.

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

Add '-30' to each side of the equation.
30 + -30 + -2x = 0 + -30

Combine like terms: 30 + -30 = 0
0 + -2x = 0 + -30
-2x = 0 + -30

Combine like terms: 0 + -30 = -30
-2x = -30

Divide each side by '-2'.
x = 15

Simplifying
x = 15

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