9x-3(7-x)=51

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Solution for 9x-3(7-x)=51 equation:


Simplifying
9x + -3(7 + -1x) = 51
9x + (7 * -3 + -1x * -3) = 51
9x + (-21 + 3x) = 51

Reorder the terms:
-21 + 9x + 3x = 51

Combine like terms: 9x + 3x = 12x
-21 + 12x = 51

Solving
-21 + 12x = 51

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 + 12x = 51 + 21

Combine like terms: -21 + 21 = 0
0 + 12x = 51 + 21
12x = 51 + 21

Combine like terms: 51 + 21 = 72
12x = 72

Divide each side by '12'.
x = 6

Simplifying
x = 6

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