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 = 84
-3x = 84

Divide each side by '-3'.
x = -28

Simplifying
x = -28

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