4x-(-9y)=12

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Solution for 4x-(-9y)=12 equation: 


Simplifying
4x + -1(-9y) = 12

Remove parenthesis around (-9y)
4x + -1 * -9y = 12

Multiply -1 * -9
4x + 9y = 12

Solving
4x + 9y = 12

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.
4x + 9y + -9y = 12 + -9y

Combine like terms: 9y + -9y = 0
4x + 0 = 12 + -9y
4x = 12 + -9y

Divide each side by '4'.
x = 3 + -2.25y

Simplifying
x = 3 + -2.25y

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