50+x+x=90

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Solution for 50+x+x=90 equation: 


Simplifying
50 + x + x = 90

Combine like terms: x + x = 2x
50 + 2x = 90

Solving
50 + 2x = 90

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 + 2x = 90 + -50

Combine like terms: 50 + -50 = 0
0 + 2x = 90 + -50
2x = 90 + -50

Combine like terms: 90 + -50 = 40
2x = 40

Divide each side by '2'.
x = 20

Simplifying
x = 20

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