=3(2X+9)+4(7-X)-12

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Solution for =3(2X+9)+4(7-X)-12 equation: 


Simplifying
0 = 3(2X + 9) + 4(7 + -1X) + -12

Reorder the terms:
0 = 3(9 + 2X) + 4(7 + -1X) + -12
0 = (9 * 3 + 2X * 3) + 4(7 + -1X) + -12
0 = (27 + 6X) + 4(7 + -1X) + -12
0 = 27 + 6X + (7 * 4 + -1X * 4) + -12
0 = 27 + 6X + (28 + -4X) + -12

Reorder the terms:
0 = 27 + 28 + -12 + 6X + -4X

Combine like terms: 27 + 28 = 55
0 = 55 + -12 + 6X + -4X

Combine like terms: 55 + -12 = 43
0 = 43 + 6X + -4X

Combine like terms: 6X + -4X = 2X
0 = 43 + 2X

Solving
0 = 43 + 2X

Solving for variable 'X'.

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

Add '-2X' to each side of the equation.
0 + -2X = 43 + 2X + -2X
Remove the zero:
-2X = 43 + 2X + -2X

Combine like terms: 2X + -2X = 0
-2X = 43 + 0
-2X = 43

Divide each side by '-2'.
X = -21.5

Simplifying
X = -21.5

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