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Simplifying 78 = 2a + 8(9) Multiply 8 * 9 78 = 2a + 72 Reorder the terms: 78 = 72 + 2a Solving 78 = 72 + 2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. 78 + -2a = 72 + 2a + -2a Combine like terms: 2a + -2a = 0 78 + -2a = 72 + 0 78 + -2a = 72 Add '-78' to each side of the equation. 78 + -78 + -2a = 72 + -78 Combine like terms: 78 + -78 = 0 0 + -2a = 72 + -78 -2a = 72 + -78 Combine like terms: 72 + -78 = -6 -2a = -6 Divide each side by '-2'. a = 3 Simplifying a = 3
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