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Simplifying 7(7y + -8) = 21y Reorder the terms: 7(-8 + 7y) = 21y (-8 * 7 + 7y * 7) = 21y (-56 + 49y) = 21y Solving -56 + 49y = 21y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-21y' to each side of the equation. -56 + 49y + -21y = 21y + -21y Combine like terms: 49y + -21y = 28y -56 + 28y = 21y + -21y Combine like terms: 21y + -21y = 0 -56 + 28y = 0 Add '56' to each side of the equation. -56 + 56 + 28y = 0 + 56 Combine like terms: -56 + 56 = 0 0 + 28y = 0 + 56 28y = 0 + 56 Combine like terms: 0 + 56 = 56 28y = 56 Divide each side by '28'. y = 2 Simplifying y = 2
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