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Simplifying 7a + -5 = 2a + -20 Reorder the terms: -5 + 7a = 2a + -20 Reorder the terms: -5 + 7a = -20 + 2a Solving -5 + 7a = -20 + 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. -5 + 7a + -2a = -20 + 2a + -2a Combine like terms: 7a + -2a = 5a -5 + 5a = -20 + 2a + -2a Combine like terms: 2a + -2a = 0 -5 + 5a = -20 + 0 -5 + 5a = -20 Add '5' to each side of the equation. -5 + 5 + 5a = -20 + 5 Combine like terms: -5 + 5 = 0 0 + 5a = -20 + 5 5a = -20 + 5 Combine like terms: -20 + 5 = -15 5a = -15 Divide each side by '5'. a = -3 Simplifying a = -3
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