2x+1+x-1=90

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Solution for 2x+1+x-1=90 equation: 


Simplifying
2x + 1 + x + -1 = 90

Reorder the terms:
1 + -1 + 2x + x = 90

Combine like terms: 1 + -1 = 0
0 + 2x + x = 90
2x + x = 90

Combine like terms: 2x + x = 3x
3x = 90

Solving
3x = 90

Solving for variable 'x'.

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

Divide each side by '3'.
x = 30

Simplifying
x = 30

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