10+x+9=40

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Solution for 10+x+9=40 equation: 


Simplifying
10 + x + 9 = 40

Reorder the terms:
10 + 9 + x = 40

Combine like terms: 10 + 9 = 19
19 + x = 40

Solving
19 + x = 40

Solving for variable 'x'.

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

Add '-19' to each side of the equation.
19 + -19 + x = 40 + -19

Combine like terms: 19 + -19 = 0
0 + x = 40 + -19
x = 40 + -19

Combine like terms: 40 + -19 = 21
x = 21

Simplifying
x = 21

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