-(5.4+x)7.8=-78.408

Solution for -(5.4+x)7.8=-78.408 equation:

Simplifying
-1(5.4 + x) * 7.8 = -78.408

Reorder the terms for easier multiplication:
-1 * 7.8(5.4 + x) = -78.408

Multiply -1 * 7.8
-7.8(5.4 + x) = -78.408
(5.4 * -7.8 + x * -7.8) = -78.408
(-42.12 + -7.8x) = -78.408

Solving
-42.12 + -7.8x = -78.408

Solving for variable 'x'.

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

Add '42.12' to each side of the equation.
-42.12 + 42.12 + -7.8x = -78.408 + 42.12

Combine like terms: -42.12 + 42.12 = 0.00
0.00 + -7.8x = -78.408 + 42.12
-7.8x = -78.408 + 42.12

Combine like terms: -78.408 + 42.12 = -36.288
-7.8x = -36.288

Divide each side by '-7.8'.
x = 4.652307692

Simplifying
x = 4.652307692