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Simplifying 4(45) = 9a Multiply 4 * 45 180 = 9a Solving 180 = 9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9a' to each side of the equation. 180 + -9a = 9a + -9a Combine like terms: 9a + -9a = 0 180 + -9a = 0 Add '-180' to each side of the equation. 180 + -180 + -9a = 0 + -180 Combine like terms: 180 + -180 = 0 0 + -9a = 0 + -180 -9a = 0 + -180 Combine like terms: 0 + -180 = -180 -9a = -180 Divide each side by '-9'. a = 20 Simplifying a = 20
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