5x+9+4x-9=90

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Solution for 5x+9+4x-9=90 equation: 


Simplifying
5x + 9 + 4x + -9 = 90

Reorder the terms:
9 + -9 + 5x + 4x = 90

Combine like terms: 9 + -9 = 0
0 + 5x + 4x = 90
5x + 4x = 90

Combine like terms: 5x + 4x = 9x
9x = 90

Solving
9x = 90

Solving for variable 'x'.

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

Divide each side by '9'.
x = 10

Simplifying
x = 10

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