x+1(x)=20

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Solution for x+1(x)=20 equation: 


Simplifying
x + 1(x) = 20

Combine like terms: x + 1x = 2x
2x = 20

Solving
2x = 20

Solving for variable 'x'.

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

Divide each side by '2'.
x = 10

Simplifying
x = 10

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