42=(2.5*x)+x

Solution for 42=(2.5*x)+x equation:

Simplifying
42 = (2.5x) + x

Combine like terms: (2.5x) + x = 3.5x
42 = 3.5x

Solving
42 = 3.5x

Solving for variable 'x'.

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

Add '-3.5x' to each side of the equation.
42 + -3.5x = 3.5x + -3.5x

Combine like terms: 3.5x + -3.5x = 0.0
42 + -3.5x = 0.0

Add '-42' to each side of the equation.
42 + -42 + -3.5x = 0.0 + -42

Combine like terms: 42 + -42 = 0
0 + -3.5x = 0.0 + -42
-3.5x = 0.0 + -42

Combine like terms: 0.0 + -42 = -42
-3.5x = -42

Divide each side by '-3.5'.
x = 12

Simplifying
x = 12