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Simplifying an = 2(an + -1) + (an + -2) Reorder the terms: an = 2(-1 + an) + (an + -2) an = (-1 * 2 + an * 2) + (an + -2) an = (-2 + 2an) + (an + -2) Reorder the terms: an = -2 + 2an + (-2 + an) Remove parenthesis around (-2 + an) an = -2 + 2an + -2 + an Reorder the terms: an = -2 + -2 + 2an + an Combine like terms: -2 + -2 = -4 an = -4 + 2an + an Combine like terms: 2an + an = 3an an = -4 + 3an Solving an = -4 + 3an Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3an' to each side of the equation. an + -3an = -4 + 3an + -3an Combine like terms: an + -3an = -2an -2an = -4 + 3an + -3an Combine like terms: 3an + -3an = 0 -2an = -4 + 0 -2an = -4 Divide each side by '-2n'. a = 2n-1 Simplifying a = 2n-1
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