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Simplifying -1(7 + 21y) = 0 (7 * -1 + 21y * -1) = 0 (-7 + -21y) = 0 Solving -7 + -21y = 0 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -21y = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -21y = 0 + 7 -21y = 0 + 7 Combine like terms: 0 + 7 = 7 -21y = 7 Divide each side by '-21'. y = -0.3333333333 Simplifying y = -0.3333333333
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