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Simplifying 7a + 9 + 3 = -18 Reorder the terms: 9 + 3 + 7a = -18 Combine like terms: 9 + 3 = 12 12 + 7a = -18 Solving 12 + 7a = -18 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 7a = -18 + -12 Combine like terms: 12 + -12 = 0 0 + 7a = -18 + -12 7a = -18 + -12 Combine like terms: -18 + -12 = -30 7a = -30 Divide each side by '7'. a = -4.285714286 Simplifying a = -4.285714286
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