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Simplifying 10a + -21 = 2a + -5 Reorder the terms: -21 + 10a = 2a + -5 Reorder the terms: -21 + 10a = -5 + 2a Solving -21 + 10a = -5 + 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. -21 + 10a + -2a = -5 + 2a + -2a Combine like terms: 10a + -2a = 8a -21 + 8a = -5 + 2a + -2a Combine like terms: 2a + -2a = 0 -21 + 8a = -5 + 0 -21 + 8a = -5 Add '21' to each side of the equation. -21 + 21 + 8a = -5 + 21 Combine like terms: -21 + 21 = 0 0 + 8a = -5 + 21 8a = -5 + 21 Combine like terms: -5 + 21 = 16 8a = 16 Divide each side by '8'. a = 2 Simplifying a = 2
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