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Simplifying -5r(2a) = 2x2 + -5x + 1 Remove parenthesis around (2a) -5r * 2a = 2x2 + -5x + 1 Reorder the terms for easier multiplication: -5 * 2r * a = 2x2 + -5x + 1 Multiply -5 * 2 -10r * a = 2x2 + -5x + 1 Multiply r * a -10ar = 2x2 + -5x + 1 Reorder the terms: -10ar = 1 + -5x + 2x2 Solving -10ar = 1 + -5x + 2x2 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Divide each side by '-10r'. a = -0.1r-1 + 0.5r-1x + -0.2r-1x2 Simplifying a = -0.1r-1 + 0.5r-1x + -0.2r-1x2
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