20-x-3(2x+1)=12

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Solution for 20-x-3(2x+1)=12 equation:


Simplifying
20 + -1x + -3(2x + 1) = 12

Reorder the terms:
20 + -1x + -3(1 + 2x) = 12
20 + -1x + (1 * -3 + 2x * -3) = 12
20 + -1x + (-3 + -6x) = 12

Reorder the terms:
20 + -3 + -1x + -6x = 12

Combine like terms: 20 + -3 = 17
17 + -1x + -6x = 12

Combine like terms: -1x + -6x = -7x
17 + -7x = 12

Solving
17 + -7x = 12

Solving for variable 'x'.

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

Add '-17' to each side of the equation.
17 + -17 + -7x = 12 + -17

Combine like terms: 17 + -17 = 0
0 + -7x = 12 + -17
-7x = 12 + -17

Combine like terms: 12 + -17 = -5
-7x = -5

Divide each side by '-7'.
x = 0.7142857143

Simplifying
x = 0.7142857143

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