0.9x-0.7y=8.1

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Solution for 0.9x-0.7y=8.1 equation: 


Simplifying
0.9x + -0.7y = 8.1

Solving
0.9x + -0.7y = 8.1

Solving for variable 'x'.

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

Add '0.7y' to each side of the equation.
0.9x + -0.7y + 0.7y = 8.1 + 0.7y

Combine like terms: -0.7y + 0.7y = 0.0
0.9x + 0.0 = 8.1 + 0.7y
0.9x = 8.1 + 0.7y

Divide each side by '0.9'.
x = 9 + 0.7777777778y

Simplifying
x = 9 + 0.7777777778y

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