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

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


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

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

Reorder the terms:
-9 = 21 + 3x + 7x

Combine like terms: 3x + 7x = 10x
-9 = 21 + 10x

Solving
-9 = 21 + 10x

Solving for variable 'x'.

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

Add '-10x' to each side of the equation.
-9 + -10x = 21 + 10x + -10x

Combine like terms: 10x + -10x = 0
-9 + -10x = 21 + 0
-9 + -10x = 21

Add '9' to each side of the equation.
-9 + 9 + -10x = 21 + 9

Combine like terms: -9 + 9 = 0
0 + -10x = 21 + 9
-10x = 21 + 9

Combine like terms: 21 + 9 = 30
-10x = 30

Divide each side by '-10'.
x = -3

Simplifying
x = -3

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