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Simplifying 7(4y + -3) = 21y Reorder the terms: 7(-3 + 4y) = 21y (-3 * 7 + 4y * 7) = 21y (-21 + 28y) = 21y Solving -21 + 28y = 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. -21 + 28y + -21y = 21y + -21y Combine like terms: 28y + -21y = 7y -21 + 7y = 21y + -21y Combine like terms: 21y + -21y = 0 -21 + 7y = 0 Add '21' to each side of the equation. -21 + 21 + 7y = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 7y = 0 + 21 7y = 0 + 21 Combine like terms: 0 + 21 = 21 7y = 21 Divide each side by '7'. y = 3 Simplifying y = 3
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