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Simplifying -7 = 2a + -1 Reorder the terms: -7 = -1 + 2a Solving -7 = -1 + 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. -7 + -2a = -1 + 2a + -2a Combine like terms: 2a + -2a = 0 -7 + -2a = -1 + 0 -7 + -2a = -1 Add '7' to each side of the equation. -7 + 7 + -2a = -1 + 7 Combine like terms: -7 + 7 = 0 0 + -2a = -1 + 7 -2a = -1 + 7 Combine like terms: -1 + 7 = 6 -2a = 6 Divide each side by '-2'. a = -3 Simplifying a = -3
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