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Simplifying r3 + -1r2 + a = 0 Reorder the terms: a + -1r2 + r3 = 0 Solving a + -1r2 + r3 = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add 'r2' to each side of the equation. a + -1r2 + r2 + r3 = 0 + r2 Combine like terms: -1r2 + r2 = 0 a + 0 + r3 = 0 + r2 a + r3 = 0 + r2 Remove the zero: a + r3 = r2 Add '-1r3' to each side of the equation. a + r3 + -1r3 = r2 + -1r3 Combine like terms: r3 + -1r3 = 0 a + 0 = r2 + -1r3 a = r2 + -1r3 Simplifying a = r2 + -1r3
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