-3+2(x+3)=42

Solution for -3+2(x+3)=42 equation:

Simplifying
-3 + 2(x + 3) = 42

Reorder the terms:
-3 + 2(3 + x) = 42
-3 + (3 * 2 + x * 2) = 42
-3 + (6 + 2x) = 42

Combine like terms: -3 + 6 = 3
3 + 2x = 42

Solving
3 + 2x = 42

Solving for variable 'x'.

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

Add '-3' to each side of the equation.
3 + -3 + 2x = 42 + -3

Combine like terms: 3 + -3 = 0
0 + 2x = 42 + -3
2x = 42 + -3

Combine like terms: 42 + -3 = 39
2x = 39

Divide each side by '2'.
x = 19.5

Simplifying
x = 19.5