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Simplifying 7a + (-2) = (-2a) + 25 7a + -2 = (-2a) + 25 Reorder the terms: -2 + 7a = (-2a) + 25 Reorder the terms: -2 + 7a = 25 + (-2a) Solving -2 + 7a = 25 + (-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. -2 + 7a + (2a) = 25 + (-2a) + (2a) Combine like terms: 7a + (2a) = 9a -2 + 9a = 25 + (-2a) + (2a) Combine like terms: (-2a) + (2a) = 0 -2 + 9a = 25 + 0 -2 + 9a = 25 Add '2' to each side of the equation. -2 + 2 + 9a = 25 + 2 Combine like terms: -2 + 2 = 0 0 + 9a = 25 + 2 9a = 25 + 2 Combine like terms: 25 + 2 = 27 9a = 27 Divide each side by '9'. a = 3 Simplifying a = 3
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