2(21)+2(4+5x)=399

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Solution for 2(21)+2(4+5x)=399 equation: 


Simplifying
2(21) + 2(4 + 5x) = 399

Multiply 2 * 21
42 + 2(4 + 5x) = 399
42 + (4 * 2 + 5x * 2) = 399
42 + (8 + 10x) = 399

Combine like terms: 42 + 8 = 50
50 + 10x = 399

Solving
50 + 10x = 399

Solving for variable 'x'.

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

Add '-50' to each side of the equation.
50 + -50 + 10x = 399 + -50

Combine like terms: 50 + -50 = 0
0 + 10x = 399 + -50
10x = 399 + -50

Combine like terms: 399 + -50 = 349
10x = 349

Divide each side by '10'.
x = 34.9

Simplifying
x = 34.9

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