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Simplifying 5a + 3 + -3d = -7 Reorder the terms: 3 + 5a + -3d = -7 Solving 3 + 5a + -3d = -7 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + 5a + -3 + -3d = -7 + -3 Reorder the terms: 3 + -3 + 5a + -3d = -7 + -3 Combine like terms: 3 + -3 = 0 0 + 5a + -3d = -7 + -3 5a + -3d = -7 + -3 Combine like terms: -7 + -3 = -10 5a + -3d = -10 Add '3d' to each side of the equation. 5a + -3d + 3d = -10 + 3d Combine like terms: -3d + 3d = 0 5a + 0 = -10 + 3d 5a = -10 + 3d Divide each side by '5'. a = -2 + 0.6d Simplifying a = -2 + 0.6d
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