10+x+2x=31

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Solution for 10+x+2x=31 equation: 


Simplifying
10 + x + 2x = 31

Combine like terms: x + 2x = 3x
10 + 3x = 31

Solving
10 + 3x = 31

Solving for variable 'x'.

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

Add '-10' to each side of the equation.
10 + -10 + 3x = 31 + -10

Combine like terms: 10 + -10 = 0
0 + 3x = 31 + -10
3x = 31 + -10

Combine like terms: 31 + -10 = 21
3x = 21

Divide each side by '3'.
x = 7

Simplifying
x = 7

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