(3x+x)(x+1)=

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Solution for (3x+x)(x+1)= equation: 


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

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

Remove parenthesis around (4x)
4x(x + 1) = 0

Reorder the terms:
4x(1 + x) = 0
(1 * 4x + x * 4x) = 0
(4x + 4x2) = 0

Solving
4x + 4x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '4x'.
4x(1 + x) = 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 '(1 + x)' equal to zero and attempt to solve:

Simplifying
1 + x = 0

Solving
1 + x = 0

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

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

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

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

Simplifying
x = -1
Solution
x = {0, -1}

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