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Simplifying -2(5a + -7) = 21 Reorder the terms: -2(-7 + 5a) = 21 (-7 * -2 + 5a * -2) = 21 (14 + -10a) = 21 Solving 14 + -10a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + -10a = 21 + -14 Combine like terms: 14 + -14 = 0 0 + -10a = 21 + -14 -10a = 21 + -14 Combine like terms: 21 + -14 = 7 -10a = 7 Divide each side by '-10'. a = -0.7 Simplifying a = -0.7
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