3(4-x)-x=-13

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Solution for 3(4-x)-x=-13 equation:


Simplifying
3(4 + -1x) + -1x = -13
(4 * 3 + -1x * 3) + -1x = -13
(12 + -3x) + -1x = -13

Combine like terms: -3x + -1x = -4x
12 + -4x = -13

Solving
12 + -4x = -13

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + -4x = -13 + -12

Combine like terms: 12 + -12 = 0
0 + -4x = -13 + -12
-4x = -13 + -12

Combine like terms: -13 + -12 = -25
-4x = -25

Divide each side by '-4'.
x = 6.25

Simplifying
x = 6.25

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