((5.8*7)+(x*3))=5.5

Solution for ((5.8*7)+(x*3))=5.5 equation:

Simplifying
((5.8 * 7) + (x * 3)) = 5.5

Multiply 5.8 * 7
((40.6) + (x * 3)) = 5.5
(40.6 + (x * 3)) = 5.5

Reorder the terms for easier multiplication:
(40.6 + (3x)) = 5.5

Remove parenthesis around (40.6 + (3x))
40.6 + (3x) = 5.5

Solving
40.6 + (3x) = 5.5

Solving for variable 'x'.

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

Add '-40.6' to each side of the equation.
40.6 + -40.6 + (3x) = 5.5 + -40.6

Combine like terms: 40.6 + -40.6 = 0.0
0.0 + (3x) = 5.5 + -40.6
(3x) = 5.5 + -40.6

Combine like terms: 5.5 + -40.6 = -35.1
(3x) = -35.1

Divide each side by '3'.
x = -11.7

Simplifying
x = -11.7