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Simplifying -81 = 7a + -18 Reorder the terms: -81 = -18 + 7a Solving -81 = -18 + 7a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7a' to each side of the equation. -81 + -7a = -18 + 7a + -7a Combine like terms: 7a + -7a = 0 -81 + -7a = -18 + 0 -81 + -7a = -18 Add '81' to each side of the equation. -81 + 81 + -7a = -18 + 81 Combine like terms: -81 + 81 = 0 0 + -7a = -18 + 81 -7a = -18 + 81 Combine like terms: -18 + 81 = 63 -7a = 63 Divide each side by '-7'. a = -9 Simplifying a = -9
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