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Simplifying 18 = -3(-7 + -2a) 18 = (-7 * -3 + -2a * -3) 18 = (21 + 6a) Solving 18 = 21 + 6a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-6a' to each side of the equation. 18 + -6a = 21 + 6a + -6a Combine like terms: 6a + -6a = 0 18 + -6a = 21 + 0 18 + -6a = 21 Add '-18' to each side of the equation. 18 + -18 + -6a = 21 + -18 Combine like terms: 18 + -18 = 0 0 + -6a = 21 + -18 -6a = 21 + -18 Combine like terms: 21 + -18 = 3 -6a = 3 Divide each side by '-6'. a = -0.5 Simplifying a = -0.5
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