21=-7x+5(x+7)

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Solution for 21=-7x+5(x+7) equation:


Simplifying
21 = -7x + 5(x + 7)

Reorder the terms:
21 = -7x + 5(7 + x)
21 = -7x + (7 * 5 + x * 5)
21 = -7x + (35 + 5x)

Reorder the terms:
21 = 35 + -7x + 5x

Combine like terms: -7x + 5x = -2x
21 = 35 + -2x

Solving
21 = 35 + -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.
21 + 2x = 35 + -2x + 2x

Combine like terms: -2x + 2x = 0
21 + 2x = 35 + 0
21 + 2x = 35

Add '-21' to each side of the equation.
21 + -21 + 2x = 35 + -21

Combine like terms: 21 + -21 = 0
0 + 2x = 35 + -21
2x = 35 + -21

Combine like terms: 35 + -21 = 14
2x = 14

Divide each side by '2'.
x = 7

Simplifying
x = 7

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