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Simplifying r(a + r2 + -1r4) = 0 (a * r + r2 * r + -1r4 * r) = 0 (ar + r3 + -1r5) = 0 Solving ar + r3 + -1r5 = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1r3' to each side of the equation. ar + r3 + -1r3 + -1r5 = 0 + -1r3 Combine like terms: r3 + -1r3 = 0 ar + 0 + -1r5 = 0 + -1r3 ar + -1r5 = 0 + -1r3 Remove the zero: ar + -1r5 = -1r3 Add 'r5' to each side of the equation. ar + -1r5 + r5 = -1r3 + r5 Combine like terms: -1r5 + r5 = 0 ar + 0 = -1r3 + r5 ar = -1r3 + r5 Divide each side by 'r'. a = -1r2 + r4 Simplifying a = -1r2 + r4
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