.4X-9=7X+12

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Solution for .4X-9=7X+12 equation:


Simplifying
0.4X + -9 = 7X + 12

Reorder the terms:
-9 + 0.4X = 7X + 12

Reorder the terms:
-9 + 0.4X = 12 + 7X

Solving
-9 + 0.4X = 12 + 7X

Solving for variable 'X'.

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

Add '-7X' to each side of the equation.
-9 + 0.4X + -7X = 12 + 7X + -7X

Combine like terms: 0.4X + -7X = -6.6X
-9 + -6.6X = 12 + 7X + -7X

Combine like terms: 7X + -7X = 0
-9 + -6.6X = 12 + 0
-9 + -6.6X = 12

Add '9' to each side of the equation.
-9 + 9 + -6.6X = 12 + 9

Combine like terms: -9 + 9 = 0
0 + -6.6X = 12 + 9
-6.6X = 12 + 9

Combine like terms: 12 + 9 = 21
-6.6X = 21

Divide each side by '-6.6'.
X = -3.181818182

Simplifying
X = -3.181818182

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