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

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


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

Reorder the terms:
-21 + -3x = 4(x + 7)

Reorder the terms:
-21 + -3x = 4(7 + x)
-21 + -3x = (7 * 4 + x * 4)
-21 + -3x = (28 + 4x)

Solving
-21 + -3x = 28 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
-21 + -3x + -4x = 28 + 4x + -4x

Combine like terms: -3x + -4x = -7x
-21 + -7x = 28 + 4x + -4x

Combine like terms: 4x + -4x = 0
-21 + -7x = 28 + 0
-21 + -7x = 28

Add '21' to each side of the equation.
-21 + 21 + -7x = 28 + 21

Combine like terms: -21 + 21 = 0
0 + -7x = 28 + 21
-7x = 28 + 21

Combine like terms: 28 + 21 = 49
-7x = 49

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

Simplifying
x = -7

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