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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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