9=7x+3(x-7)

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


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

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

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

Combine like terms: 7x + 3x = 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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