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Simplifying 9 * 20 = 4 * 3a Multiply 9 * 20 180 = 4 * 3a Multiply 4 * 3 180 = 12a Solving 180 = 12a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12a' to each side of the equation. 180 + -12a = 12a + -12a Combine like terms: 12a + -12a = 0 180 + -12a = 0 Add '-180' to each side of the equation. 180 + -180 + -12a = 0 + -180 Combine like terms: 180 + -180 = 0 0 + -12a = 0 + -180 -12a = 0 + -180 Combine like terms: 0 + -180 = -180 -12a = -180 Divide each side by '-12'. a = 15 Simplifying a = 15
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