2(x+21)+(2x+9)=90

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Solution for 2(x+21)+(2x+9)=90 equation: 


Simplifying
2(x + 21) + (2x + 9) = 90

Reorder the terms:
2(21 + x) + (2x + 9) = 90
(21 * 2 + x * 2) + (2x + 9) = 90
(42 + 2x) + (2x + 9) = 90

Reorder the terms:
42 + 2x + (9 + 2x) = 90

Remove parenthesis around (9 + 2x)
42 + 2x + 9 + 2x = 90

Reorder the terms:
42 + 9 + 2x + 2x = 90

Combine like terms: 42 + 9 = 51
51 + 2x + 2x = 90

Combine like terms: 2x + 2x = 4x
51 + 4x = 90

Solving
51 + 4x = 90

Solving for variable 'x'.

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

Add '-51' to each side of the equation.
51 + -51 + 4x = 90 + -51

Combine like terms: 51 + -51 = 0
0 + 4x = 90 + -51
4x = 90 + -51

Combine like terms: 90 + -51 = 39
4x = 39

Divide each side by '4'.
x = 9.75

Simplifying
x = 9.75

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