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Simplifying -1(-1 + 10y) = -20 + -31y (-1 * -1 + 10y * -1) = -20 + -31y (1 + -10y) = -20 + -31y Solving 1 + -10y = -20 + -31y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '31y' to each side of the equation. 1 + -10y + 31y = -20 + -31y + 31y Combine like terms: -10y + 31y = 21y 1 + 21y = -20 + -31y + 31y Combine like terms: -31y + 31y = 0 1 + 21y = -20 + 0 1 + 21y = -20 Add '-1' to each side of the equation. 1 + -1 + 21y = -20 + -1 Combine like terms: 1 + -1 = 0 0 + 21y = -20 + -1 21y = -20 + -1 Combine like terms: -20 + -1 = -21 21y = -21 Divide each side by '21'. y = -1 Simplifying y = -1
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