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

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


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

Reorder the terms:
21 = -3x + 7(7 + x)
21 = -3x + (7 * 7 + x * 7)
21 = -3x + (49 + 7x)

Reorder the terms:
21 = 49 + -3x + 7x

Combine like terms: -3x + 7x = 4x
21 = 49 + 4x

Solving
21 = 49 + 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 + -4x = 49 + 4x + -4x

Combine like terms: 4x + -4x = 0
21 + -4x = 49 + 0
21 + -4x = 49

Add '-21' to each side of the equation.
21 + -21 + -4x = 49 + -21

Combine like terms: 21 + -21 = 0
0 + -4x = 49 + -21
-4x = 49 + -21

Combine like terms: 49 + -21 = 28
-4x = 28

Divide each side by '-4'.
x = -7

Simplifying
x = -7

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