-4y-(-9y)=20

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Solution for -4y-(-9y)=20 equation: 


Simplifying
-4y + -1(-9y) = 20

Remove parenthesis around (-9y)
-4y + -1 * -9y = 20

Multiply -1 * -9
-4y + 9y = 20

Combine like terms: -4y + 9y = 5y
5y = 20

Solving
5y = 20

Solving for variable 'y'.

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

Divide each side by '5'.
y = 4

Simplifying
y = 4

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