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Simplifying 18a + -21 = 16a + -7 Reorder the terms: -21 + 18a = 16a + -7 Reorder the terms: -21 + 18a = -7 + 16a Solving -21 + 18a = -7 + 16a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-16a' to each side of the equation. -21 + 18a + -16a = -7 + 16a + -16a Combine like terms: 18a + -16a = 2a -21 + 2a = -7 + 16a + -16a Combine like terms: 16a + -16a = 0 -21 + 2a = -7 + 0 -21 + 2a = -7 Add '21' to each side of the equation. -21 + 21 + 2a = -7 + 21 Combine like terms: -21 + 21 = 0 0 + 2a = -7 + 21 2a = -7 + 21 Combine like terms: -7 + 21 = 14 2a = 14 Divide each side by '2'. a = 7 Simplifying a = 7
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