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Simplifying -7a + -1 = 20 + -3a Reorder the terms: -1 + -7a = 20 + -3a Solving -1 + -7a = 20 + -3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3a' to each side of the equation. -1 + -7a + 3a = 20 + -3a + 3a Combine like terms: -7a + 3a = -4a -1 + -4a = 20 + -3a + 3a Combine like terms: -3a + 3a = 0 -1 + -4a = 20 + 0 -1 + -4a = 20 Add '1' to each side of the equation. -1 + 1 + -4a = 20 + 1 Combine like terms: -1 + 1 = 0 0 + -4a = 20 + 1 -4a = 20 + 1 Combine like terms: 20 + 1 = 21 -4a = 21 Divide each side by '-4'. a = -5.25 Simplifying a = -5.25
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