-90=-5(-2y)

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Solution for -90=-5(-2y) equation:


Simplifying
-90 = -5(-2y)

Remove parenthesis around (-2y)
-90 = -5 * -2y

Multiply -5 * -2
-90 = 10y

Solving
-90 = 10y

Solving for variable 'y'.

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

Add '-10y' to each side of the equation.
-90 + -10y = 10y + -10y

Combine like terms: 10y + -10y = 0
-90 + -10y = 0

Add '90' to each side of the equation.
-90 + 90 + -10y = 0 + 90

Combine like terms: -90 + 90 = 0
0 + -10y = 0 + 90
-10y = 0 + 90

Combine like terms: 0 + 90 = 90
-10y = 90

Divide each side by '-10'.
y = -9

Simplifying
y = -9

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