9=6x+3(-x-7)

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Solution for 9=6x+3(-x-7) equation:


Simplifying
9 = 6x + 3(-1x + -7)

Reorder the terms:
9 = 6x + 3(-7 + -1x)
9 = 6x + (-7 * 3 + -1x * 3)
9 = 6x + (-21 + -3x)

Reorder the terms:
9 = -21 + 6x + -3x

Combine like terms: 6x + -3x = 3x
9 = -21 + 3x

Solving
9 = -21 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
9 + -3x = -21 + 3x + -3x

Combine like terms: 3x + -3x = 0
9 + -3x = -21 + 0
9 + -3x = -21

Add '-9' to each side of the equation.
9 + -9 + -3x = -21 + -9

Combine like terms: 9 + -9 = 0
0 + -3x = -21 + -9
-3x = -21 + -9

Combine like terms: -21 + -9 = -30
-3x = -30

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

Simplifying
x = 10

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