6+3.5(1+2x)=-25.5

Solution for 6+3.5(1+2x)=-25.5 equation:

Simplifying
6 + 3.5(1 + 2x) = -25.5
6 + (1 * 3.5 + 2x * 3.5) = -25.5
6 + (3.5 + 7x) = -25.5

Combine like terms: 6 + 3.5 = 9.5
9.5 + 7x = -25.5

Solving
9.5 + 7x = -25.5

Solving for variable 'x'.

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

Add '-9.5' to each side of the equation.
9.5 + -9.5 + 7x = -25.5 + -9.5

Combine like terms: 9.5 + -9.5 = 0.0
0.0 + 7x = -25.5 + -9.5
7x = -25.5 + -9.5

Combine like terms: -25.5 + -9.5 = -35
7x = -35

Divide each side by '7'.
x = -5

Simplifying
x = -5