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Simplifying 79 = 2(a + -10) Reorder the terms: 79 = 2(-10 + a) 79 = (-10 * 2 + a * 2) 79 = (-20 + 2a) Solving 79 = -20 + 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. 79 + -2a = -20 + 2a + -2a Combine like terms: 2a + -2a = 0 79 + -2a = -20 + 0 79 + -2a = -20 Add '-79' to each side of the equation. 79 + -79 + -2a = -20 + -79 Combine like terms: 79 + -79 = 0 0 + -2a = -20 + -79 -2a = -20 + -79 Combine like terms: -20 + -79 = -99 -2a = -99 Divide each side by '-2'. a = 49.5 Simplifying a = 49.5
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