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

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


Simplifying
4x + -1(9x + 9) = 7x + -21

Reorder the terms:
4x + -1(9 + 9x) = 7x + -21
4x + (9 * -1 + 9x * -1) = 7x + -21
4x + (-9 + -9x) = 7x + -21

Reorder the terms:
-9 + 4x + -9x = 7x + -21

Combine like terms: 4x + -9x = -5x
-9 + -5x = 7x + -21

Reorder the terms:
-9 + -5x = -21 + 7x

Solving
-9 + -5x = -21 + 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.
-9 + -5x + -7x = -21 + 7x + -7x

Combine like terms: -5x + -7x = -12x
-9 + -12x = -21 + 7x + -7x

Combine like terms: 7x + -7x = 0
-9 + -12x = -21 + 0
-9 + -12x = -21

Add '9' to each side of the equation.
-9 + 9 + -12x = -21 + 9

Combine like terms: -9 + 9 = 0
0 + -12x = -21 + 9
-12x = -21 + 9

Combine like terms: -21 + 9 = -12
-12x = -12

Divide each side by '-12'.
x = 1

Simplifying
x = 1

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