(10y+x)-(10x+y)=9

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Solution for (10y+x)-(10x+y)=9 equation:


Simplifying
(10y + x) + -1(10x + y) = 9

Reorder the terms:
(x + 10y) + -1(10x + y) = 9

Remove parenthesis around (x + 10y)
x + 10y + -1(10x + y) = 9
x + 10y + (10x * -1 + y * -1) = 9
x + 10y + (-10x + -1y) = 9

Reorder the terms:
x + -10x + 10y + -1y = 9

Combine like terms: x + -10x = -9x
-9x + 10y + -1y = 9

Combine like terms: 10y + -1y = 9y
-9x + 9y = 9

Solving
-9x + 9y = 9

Solving for variable 'x'.

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

Add '-9y' to each side of the equation.
-9x + 9y + -9y = 9 + -9y

Combine like terms: 9y + -9y = 0
-9x + 0 = 9 + -9y
-9x = 9 + -9y

Divide each side by '-9'.
x = -1 + y

Simplifying
x = -1 + y

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