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Simplifying 4(y + -9) = y + 21 Reorder the terms: 4(-9 + y) = y + 21 (-9 * 4 + y * 4) = y + 21 (-36 + 4y) = y + 21 Reorder the terms: -36 + 4y = 21 + y Solving -36 + 4y = 21 + y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1y' to each side of the equation. -36 + 4y + -1y = 21 + y + -1y Combine like terms: 4y + -1y = 3y -36 + 3y = 21 + y + -1y Combine like terms: y + -1y = 0 -36 + 3y = 21 + 0 -36 + 3y = 21 Add '36' to each side of the equation. -36 + 36 + 3y = 21 + 36 Combine like terms: -36 + 36 = 0 0 + 3y = 21 + 36 3y = 21 + 36 Combine like terms: 21 + 36 = 57 3y = 57 Divide each side by '3'. y = 19 Simplifying y = 19
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