5x-7(x+3)=9

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Solution for 5x-7(x+3)=9 equation:


Simplifying
5x + -7(x + 3) = 9

Reorder the terms:
5x + -7(3 + x) = 9
5x + (3 * -7 + x * -7) = 9
5x + (-21 + -7x) = 9

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

Combine like terms: 5x + -7x = -2x
-21 + -2x = 9

Solving
-21 + -2x = 9

Solving for variable 'x'.

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

Add '21' to each side of the equation.
-21 + 21 + -2x = 9 + 21

Combine like terms: -21 + 21 = 0
0 + -2x = 9 + 21
-2x = 9 + 21

Combine like terms: 9 + 21 = 30
-2x = 30

Divide each side by '-2'.
x = -15

Simplifying
x = -15

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