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Simplifying -1(1 + 4y) + -7y = 21 (1 * -1 + 4y * -1) + -7y = 21 (-1 + -4y) + -7y = 21 Combine like terms: -4y + -7y = -11y -1 + -11y = 21 Solving -1 + -11y = 21 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -11y = 21 + 1 Combine like terms: -1 + 1 = 0 0 + -11y = 21 + 1 -11y = 21 + 1 Combine like terms: 21 + 1 = 22 -11y = 22 Divide each side by '-11'. y = -2 Simplifying y = -2
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