21-15=2(x-4)

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Solution for 21-15=2(x-4) equation:


Simplifying
21 + -15 = 2(x + -4)

Combine like terms: 21 + -15 = 6
6 = 2(x + -4)

Reorder the terms:
6 = 2(-4 + x)
6 = (-4 * 2 + x * 2)
6 = (-8 + 2x)

Solving
6 = -8 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
6 + -2x = -8 + 2x + -2x

Combine like terms: 2x + -2x = 0
6 + -2x = -8 + 0
6 + -2x = -8

Add '-6' to each side of the equation.
6 + -6 + -2x = -8 + -6

Combine like terms: 6 + -6 = 0
0 + -2x = -8 + -6
-2x = -8 + -6

Combine like terms: -8 + -6 = -14
-2x = -14

Divide each side by '-2'.
x = 7

Simplifying
x = 7

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