7-x=3(x+7)

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


Simplifying
7 + -1x = 3(x + 7)

Reorder the terms:
7 + -1x = 3(7 + x)
7 + -1x = (7 * 3 + x * 3)
7 + -1x = (21 + 3x)

Solving
7 + -1x = 21 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
7 + -1x + -3x = 21 + 3x + -3x

Combine like terms: -1x + -3x = -4x
7 + -4x = 21 + 3x + -3x

Combine like terms: 3x + -3x = 0
7 + -4x = 21 + 0
7 + -4x = 21

Add '-7' to each side of the equation.
7 + -7 + -4x = 21 + -7

Combine like terms: 7 + -7 = 0
0 + -4x = 21 + -7
-4x = 21 + -7

Combine like terms: 21 + -7 = 14
-4x = 14

Divide each side by '-4'.
x = -3.5

Simplifying
x = -3.5

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