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Simplifying 84 = 4(2a + 2a) Combine like terms: 2a + 2a = 4a 84 = 4(4a) Remove parenthesis around (4a) 84 = 4 * 4a Multiply 4 * 4 84 = 16a Solving 84 = 16a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-16a' to each side of the equation. 84 + -16a = 16a + -16a Combine like terms: 16a + -16a = 0 84 + -16a = 0 Add '-84' to each side of the equation. 84 + -84 + -16a = 0 + -84 Combine like terms: 84 + -84 = 0 0 + -16a = 0 + -84 -16a = 0 + -84 Combine like terms: 0 + -84 = -84 -16a = -84 Divide each side by '-16'. a = 5.25 Simplifying a = 5.25
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