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Simplifying 2(5 + -1a) = 2 + -4d (5 * 2 + -1a * 2) = 2 + -4d (10 + -2a) = 2 + -4d Solving 10 + -2a = 2 + -4d Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + -2a = 2 + -10 + -4d Combine like terms: 10 + -10 = 0 0 + -2a = 2 + -10 + -4d -2a = 2 + -10 + -4d Combine like terms: 2 + -10 = -8 -2a = -8 + -4d Divide each side by '-2'. a = 4 + 2d Simplifying a = 4 + 2d
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