3x(7+2x)-(2+4x)=12

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Solution for 3x(7+2x)-(2+4x)=12 equation: 


Simplifying
3x(7 + 2x) + -1(2 + 4x) = 12
(7 * 3x + 2x * 3x) + -1(2 + 4x) = 12
(21x + 6x2) + -1(2 + 4x) = 12
21x + 6x2 + (2 * -1 + 4x * -1) = 12
21x + 6x2 + (-2 + -4x) = 12

Reorder the terms:
-2 + 21x + -4x + 6x2 = 12

Combine like terms: 21x + -4x = 17x
-2 + 17x + 6x2 = 12

Solving
-2 + 17x + 6x2 = 12

Solving for variable 'x'.

Reorder the terms:
-2 + -12 + 17x + 6x2 = 12 + -12

Combine like terms: -2 + -12 = -14
-14 + 17x + 6x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-14 + 17x + 6x2 = 0

Factor a trinomial.
(-7 + -2x)(2 + -3x) = 0


Subproblem 1
Set the factor '(-7 + -2x)' equal to zero and attempt to solve:

Simplifying
-7 + -2x = 0

Solving
-7 + -2x = 0

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

Add '7' to each side of the equation.
-7 + 7 + -2x = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -2x = 0 + 7
-2x = 0 + 7

Combine like terms: 0 + 7 = 7
-2x = 7

Divide each side by '-2'.
x = -3.5

Simplifying
x = -3.5

Subproblem 2
Set the factor '(2 + -3x)' equal to zero and attempt to solve:

Simplifying
2 + -3x = 0

Solving
2 + -3x = 0

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

Add '-2' to each side of the equation.
2 + -2 + -3x = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -3x = 0 + -2
-3x = 0 + -2

Combine like terms: 0 + -2 = -2
-3x = -2

Divide each side by '-3'.
x = 0.6666666667

Simplifying
x = 0.6666666667
Solution
x = {-3.5, 0.6666666667}

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