(x+3x)*(5-x)=0

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Solution for (x+3x)*(5-x)=0 equation: 


Simplifying
(x + 3x)(5 + -1x) = 0

Combine like terms: x + 3x = 4x
(4x)(5 + -1x) = 0

Remove parenthesis around (4x)
4x(5 + -1x) = 0
(5 * 4x + -1x * 4x) = 0
(20x + -4x2) = 0

Solving
20x + -4x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '4x'.
4x(5 + -1x) = 0

Ignore the factor 4.

Subproblem 1
Set the factor 'x' equal to zero and attempt to solve:

Simplifying
x = 0

Solving
x = 0

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

Simplifying
x = 0

Subproblem 2
Set the factor '(5 + -1x)' equal to zero and attempt to solve:

Simplifying
5 + -1x = 0

Solving
5 + -1x = 0

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

Add '-5' to each side of the equation.
5 + -5 + -1x = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -1x = 0 + -5
-1x = 0 + -5

Combine like terms: 0 + -5 = -5
-1x = -5

Divide each side by '-1'.
x = 5

Simplifying
x = 5
Solution
x = {0, 5}

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