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Simplifying
x(3.8) = 9(4) + -9x

Reorder the terms for easier multiplication:
3.8x = 9(4) + -9x

Multiply 9 * 4
3.8x = 36 + -9x

Solving
3.8x = 36 + -9x

Solving for variable 'x'.

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

Add '9x' to each side of the equation.
3.8x + 9x = 36 + -9x + 9x

Combine like terms: 3.8x + 9x = 12.8x
12.8x = 36 + -9x + 9x

Combine like terms: -9x + 9x = 0
12.8x = 36 + 0
12.8x = 36

Divide each side by '12.8'.
x = 2.8125

Simplifying
x = 2.8125
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