4x+21=7(x+9)

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Solution for 4x+21=7(x+9) equation:


Simplifying
4x + 21 = 7(x + 9)

Reorder the terms:
21 + 4x = 7(x + 9)

Reorder the terms:
21 + 4x = 7(9 + x)
21 + 4x = (9 * 7 + x * 7)
21 + 4x = (63 + 7x)

Solving
21 + 4x = 63 + 7x

Solving for variable 'x'.

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

Add '-7x' to each side of the equation.
21 + 4x + -7x = 63 + 7x + -7x

Combine like terms: 4x + -7x = -3x
21 + -3x = 63 + 7x + -7x

Combine like terms: 7x + -7x = 0
21 + -3x = 63 + 0
21 + -3x = 63

Add '-21' to each side of the equation.
21 + -21 + -3x = 63 + -21

Combine like terms: 21 + -21 = 0
0 + -3x = 63 + -21
-3x = 63 + -21

Combine like terms: 63 + -21 = 42
-3x = 42

Divide each side by '-3'.
x = -14

Simplifying
x = -14

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