-21=7x-3(2x+4)

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Solution for -21=7x-3(2x+4) equation:


Simplifying
-21 = 7x + -3(2x + 4)

Reorder the terms:
-21 = 7x + -3(4 + 2x)
-21 = 7x + (4 * -3 + 2x * -3)
-21 = 7x + (-12 + -6x)

Reorder the terms:
-21 = -12 + 7x + -6x

Combine like terms: 7x + -6x = 1x
-21 = -12 + 1x

Solving
-21 = -12 + 1x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
-21 + -1x = -12 + 1x + -1x

Combine like terms: 1x + -1x = 0
-21 + -1x = -12 + 0
-21 + -1x = -12

Add '21' to each side of the equation.
-21 + 21 + -1x = -12 + 21

Combine like terms: -21 + 21 = 0
0 + -1x = -12 + 21
-1x = -12 + 21

Combine like terms: -12 + 21 = 9
-1x = 9

Divide each side by '-1'.
x = -9

Simplifying
x = -9

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