(11X+42)+(X)=90

Solution for (11X+42)+(X)=90 equation:

Simplifying
(11X + 42) + (X) = 90

Reorder the terms:
(42 + 11X) + (X) = 90

Remove parenthesis around (42 + 11X)
42 + 11X + (X) = 90
42 + 11X + X = 90

Combine like terms: 11X + X = 12X
42 + 12X = 90

Solving
42 + 12X = 90

Solving for variable 'X'.

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

Add '-42' to each side of the equation.
42 + -42 + 12X = 90 + -42

Combine like terms: 42 + -42 = 0
0 + 12X = 90 + -42
12X = 90 + -42

Combine like terms: 90 + -42 = 48
12X = 48

Divide each side by '12'.
X = 4

Simplifying
X = 4