-(-90)=-45a

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Solution for -(-90)=-45a equation:


Simplifying
-1(-90) = -45a

Multiply -1 * -90
90 = -45a

Solving
90 = -45a

Solving for variable 'a'.

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

Add '45a' to each side of the equation.
90 + 45a = -45a + 45a

Combine like terms: -45a + 45a = 0
90 + 45a = 0

Add '-90' to each side of the equation.
90 + -90 + 45a = 0 + -90

Combine like terms: 90 + -90 = 0
0 + 45a = 0 + -90
45a = 0 + -90

Combine like terms: 0 + -90 = -90
45a = -90

Divide each side by '45'.
a = -2

Simplifying
a = -2

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